First week nutrition for broiler chickens : effects on growth, metabolic status, organ development, and carcass composition
Lamot, David - \ 2017
Wageningen University. Promotor(en): Bas Kemp, co-promotor(en): Henry van den Brand; Peter Wijtten. - Wageningen : Wageningen University - ISBN 9789463430777 - 187
broilers - animal nutrition - poultry feeding - feeds - growth - metabolism - carcass composition - nutrition physiology - vleeskuikens - diervoeding - pluimveevoeding - voer - groei - metabolisme - karkassamenstelling - voedingsfysiologie
During the first week of life, broiler chickens undergo various developmental changes that are already initiated during incubation. Ongoing development of organs such as the gastro- intestinal tract and the immune system may affect the nutritional requirements during this age period. Despite the residual yolk that is available at hatch and that may provide nutritional support during the first days after hatch, the growth performance may be affected by the time in between hatch and first feed intake. Furthermore, it remains largely unknown to what extend nutritional composition of a pre-starter diet, as well as feed availability directly after hatch have an effect on physiological development directly after hatch, but also at later age. The aim of this thesis was to determine the impact of feed availability and feed composition provided during the first week of life on short-term physiological development, as well as potential long-term effects on growth performance of broiler chickens. Especially early hatched chickens were suggested to benefit more from direct feed access compared to midterm and late hatched chickens, as they tended to have a higher body weight gain during the first week after hatch. A delay in feed access for 48 h resulted in lowered body weight gain and feed intake when compared to direct feed access, but so did a short (13 to 26 h) delay in feed access after hatch. In the latter case, delayed feed access resulted in a lower weight to length ratio of the jejunum and ileum at 4 d of age compared with chickens with direct feed access. Although delayed feed access after hatch resulted in lower body weight gain during the first week after hatch and thereafter, it can be discussed whether this is truly an impairment of long-term growth or just a delayed onset of growth. With respect to feed composition, the inclusion of fish oil and medium chain fatty acids in a pre-starter diet had minor effects on humoral immune function. Inclusion of medium chain fatty acids did result in higher body weight gain and lowered feed efficiency during the first week of life, but only during the period it was provided. Feeding increased diet densities during the first week of life, obtained by formulating diets with different dietary fat levels, resulted in an increased gain to feed ratio, whereas body weight gain and feed intake decreased. Despite the shift in dietary energy supply from carbohydrates to fat and the perceived lower fat digestibility in young broiler chickens, nitrogen metabolizability and fat digestibility were not affected in the current study by feeding increased diet densities. The relative crop, liver and pancreas weights decreased when feeding increased diet densities, whereas the length of the entire intestinal tract increased. This suggests that broiler chickens repartition visceral organ development in response to feeding more concentrated diets during the first week of life. Interestingly, protein and fat accretion were not affected. Continued feeding of increased diet densities after 7 d of age resulted in increased BW gain, G:F ratio and metabolizable energy intake, but mainly during the periods that these diets were provided. In summary, even short durations of delayed feed access already impact intestinal development of young broiler chickens. However, a delayed feed access up to 48 h after hatch does not result in impaired growth, but only a delayed onset of growth. Even though digestibility of fats and oils may be suboptimal in young broiler chickens, feeding of these diets does not have to result in lowered performance per se. Young broiler chickens appear to adapt themselves towards high density diets with high fat inclusion levels in the first week of life, enabling them to digest and metabolize these diet types despite a suboptimal capacity for fat digestion. High density diets result in higher growth performance, but only for the period these diets are provided and thus carry-over effects at later age appear to be limited.
A Genome-Wide Association Study Reveals Dominance Effects on Number of Teats in Pigs
Lopes, M.S. ; Bastiaansen, J.W.M. ; Harlizius, B. ; Knol, E.F. ; Bovenhuis, H. - \ 2014
PLoS ONE 9 (2014)8. - ISSN 1932-6203 - 8 p.
quantitative trait loci - milk fatty-acids - resource population - affecting reproduction - carcass composition - genetic-basis - dairy-cattle - meat quality - qtl analysis - meishan
Dominance has been suggested as one of the genetic mechanisms explaining heterosis. However, using traditional quantitative genetic methods it is difficult to obtain accurate estimates of dominance effects. With the availability of dense SNP (Single Nucleotide Polymorphism) panels, we now have new opportunities for the detection and use of dominance at individual loci. Thus, the aim of this study was to detect additive and dominance effects on number of teats (NT), specifically to investigate the importance of dominance in a Landrace-based population of pigs. In total, 1,550 animals, genotyped for 32,911 SNPs, were used in single SNP analysis. SNPs with a significant genetic effect were tested for their mode of gene action being additive, dominant or a combination. In total, 21 SNPs were associated with NT, located in three regions with additive (SSC6, 7 and 12) and one region with dominant effects (SSC4). Estimates of additive effects ranged from 0.24 to 0.29 teats. The dominance effect of the QTL located on SSC4 was negative (-0.26 teats). The additive variance of the four QTLs together explained 7.37% of the total phenotypic variance. The dominance variance of the four QTLs together explained 1.82% of the total phenotypic variance, which corresponds to one-fourth of the variance explained by additive effects. The results suggest that dominance effects play a relevant role in the genetic architecture of NT. The QTL region on SSC7 contains the most promising candidate gene: VRTN. This gene has been suggested to be related to the number of vertebrae, a trait correlated with NT.
Quantitative trait loci associated with pre-weaning growth in South African Angora goats
Visser, C. ; Marle-Koster, E. van; Snyman, M.A. ; Bovenhuis, H. ; Crooijmans, R.P.M.A. - \ 2013
Small Ruminant Research 112 (2013)1-3. - ISSN 0921-4488 - p. 15 - 20.
genome-wide association - microsatellite markers - genetic-parameters - parentage verification - conformation traits - carcass composition - wool production - fleece traits - merino sheep - beef-cattle
This study aimed to identify chromosomal regions associated with genetic variation in pre-weaning growth traits in Angora goats. A genome-wide scan was performed by genotyping 1042 offspring from 12 half-sib families using 88 microsatellite caprine markers covering 1368cM. Phenotypes were recorded at birth (BW) and weaning (WW) and analysed using GridQTL software. A total of six putative QTL were detected on six different chromosomes, all at chromosome-wide significance level. Four QTL were identified for BW on CHI 4, 8, 17 and 27 and two QTL for WW on CHI 16 and 19. QTL effects ranged from -0.32 to 0.25 in units of residual standard deviation in different families. Some of these QTL correspond to chromosomes where QTL associated with growth have been identified in other species. These chromosomal segments hold potential to influence weight gain in young goats.
Number and mode of inheritance of QTL influencing backfat thickness on SSC2p in Sino-European pig pedigrees
Tortereau, F.J.D. ; Gilbert, H.J. ; Heuven, H.C.M. ; Bidanel, J.P. ; Groenen, M.A.M. ; Riquet, J. - \ 2011
Genetics, Selection, Evolution 43 (2011). - ISSN 0999-193X - 9 p.
quantitative trait loci - igf2-intron3-g3072a substitution - carcass composition - alternative models - colorectal-cancer - affecting growth - imprinted qtl - meat quality - muscle mass - sus-scrofa
Background In the pig, multiple QTL associated with growth and fatness traits have been mapped to chromosome 2 (SSC2) and among these, at least one shows paternal expression due to the IGF2-intron3-G3072A substitution. Previously published results on the position and imprinting status of this QTL disagree between analyses from French and Dutch F2 crossbred pig populations obtained with the same breeds (Meishan crossed with Large White or Landrace). MethodsTo study the role of paternal and maternal alleles at the IGF2 locus and to test the hypothesis of a second QTL affecting backfat thickness on the short arm of SSC2 (SSC2p), a QTL mapping analysis was carried out on a combined pedigree including both the French and Dutch F2 populations, on the progeny of F1 males that were heterozygous (A/G) and homozygous (G/G) at the IGF2 locus. Simulations were performed to clarify the relations between the two QTL and to understand to what extent they can explain the discrepancies previously reported. Results The QTL analyses showed the segregation of at least two QTL on chromosome 2 in both pedigrees, i.e. the IGF2 locus and a second QTL segregating at least in the G/G F1 males and located between positions 30 and 51 cM. Statistical analyses highlighted that the maternally inherited allele at the IGF2 locus had a significant effect but simulation studies showed that this is probably a spurious effect due to the segregation of the second QTL. Conclusions Our results show that two QTL on SSC2p affect backfat thickness. Differences in the pedigree structures and in the number of heterozygous females at the IGF2 locus result in different imprinting statuses in the two pedigrees studied. The spurious effect observed when a maternally allele is present at the IGF2 locus, is in fact due to the presence of a second closely located QTL. This work confirms that pig chromosome 2 is a major region associated with fattening traits.
Uitsnijden van varkenskarkassen voor het opstellen van een formule om het vleespercentage met de HGP7 (Hennessy Grading Probe), CGM (Capteur Gras/Maigre-Sydel) en de CSB (Image Meater) te schatten = Lean meat equation for the Hennessy Grading Probe (HGP7), Capteur Gras/Maigre-Sydel (CGM and CSB-Image-Meater (CSB)
Lambooij, E. ; Engel, B. ; Buist, W.G. ; Vereijken, P.F.G. - \ 2011
Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 478) - 25
varkenshouderij - slachtdieren - slacht - mager vlees - schatting - varkensvlees - vleessamenstelling - karkassamenstelling - pig farming - meat animals - slaughter - lean - estimation - pigmeat - meat composition - carcass composition
For each of the instruments HGP7, CGM and CSB-Image-Meater a prediction formula for the percentage lean meat in a pig carcass was derived.
Meta-Analysis of Results from Quantitative Trait Loci Mapping Studies on Pig Chromosome 4
Moraes Silva, K.M. De; Bastiaansen, J.W.M. ; Knol, E.F. ; Merks, J.W.M. ; Lopes, P.S. ; Guimaraes, R.M. ; Arendonk, J.A.M. van - \ 2011
Animal Genetics 42 (2011)3. - ISSN 0268-9146 - p. 280 - 292.
pietrain resource population - meat quality traits - large white-pigs - confidence-intervals - carcass composition - body-composition - glycogen-content - skeletal-muscle - complex traits - sus-scrofa
Meta-analysis of results from multiple studies could lead to more precise quantitative trait loci (QTL) position estimates compared to the individual experiments. As the raw data from many different studies are not readily available, the use of results from published articles may be helpful. In this study, we performed a meta-analysis of QTL on chromosome 4 in pig, using data from 25 separate experiments. First, a meta-analysis was performed for individual traits: average daily gain and backfat thickness. Second, a meta-analysis was performed for the QTL of three traits affecting loin yield: loin eye area, carcass length and loin meat weight. Third, 78 QTL were selected from 20 traits that could be assigned to one of three broad categories: carcass, fatness or growth traits. For each analysis, the number of identified meta-QTL was smaller than the number of initial QTL. The reduction in the number of QTL ranged from 71% to 86% compared to the total number before the meta-analysis. In addition, the meta-analysis reduced the QTL confidence intervals by as much as 85% compared to individual QTL estimates. The reduction in the confidence interval was greater when a large number of independent QTL was included in the meta-analysis. Meta-QTL related to growth and fatness were found in the same region as the FAT1 region. Results indicate that the meta-analysis is an efficient strategy to estimate the number and refine the positions of QTL when QTL estimates are available from multiple populations and experiments. This strategy can be used to better target further studies such as the selection of candidate genes related to trait variation.
The influence of diets supplemented with conjugated linoleic acid, selenium, and vitamin E, with or without animal protein, on the composition of pork from female pigs
Morel, P.C. ; Janz, J.A. ; Zou, M. ; Purchas, R.W. ; Hendriks, W.H. ; Wilkinson, B.H. - \ 2008
Journal of Animal Science 86 (2008)5. - ISSN 0021-8812 - p. 1145 - 1155.
meat quality characteristics - polyunsaturated fatty-acids - alpha-tocopherol - carcass composition - sodium selenite - weaned piglets - growing pigs - performance - growth - tissues
The objective of this study was to evaluate the effect of dietary manipulations on the fatty acid composition, Se content, and vitamin E content of pork. Sixty Duroc-cross gilts were randomly allocated at weaning to 1 of 4 dietary treatment groups (n = 15 per group). The 4 experimental diets were based on animal plus plant components or plant components only, with or without the inclusion of a dietary supplement (0.614%) containing CLA, Se, and vitamin E. The growth performance to approximately 100 kg of BW was similar with diets containing animal plus plant components or only plant components. Growth was also similar when either of these diets included the supplement. Inclusion of the supplement led to expected increases in Se and vitamin E contents (P <0.001) of the LM. The differences found in the fatty acid profile of the lipid in LM, loin subcutaneous fat, and the belly cut (pork belly) between the groups with and without animal components in their diets largely reflected differences in the diet composition. Inclusion of the supplement led to greater CLA contents in all 3 tissues (P <0.001), and also to lower contents of oleic acid (P <0.001) and greater contents of stearic acid (P <0.05), possibly due to an inhibition of stearoyl-CoA desaturase enzyme. The supplement also led to an increase in LM intramuscular fat (P <0.05), but did not affect P2 fat depths (65 mm lateral to the midline of the spine at the last rib; mean depth of 11.8 mm). It is concluded that changing from a part animal component diet to an all plant diet will not change the growth performance of pigs but changes in the fatty acid profile of pork are likely to occur. It is further concluded that the nutritional value of pork may be successfully enhanced by simultaneously supplementing the diet with CLA, selenium, and vitamin E.
In silico identification and mapping of microsatellite markers on Sus scrofa chromosome 4
Wijk, H.J. van; Liefers, S.C. ; Buschbell, H. ; Dibbits, B.W. ; Harlizius, B. ; Groenen, M.A.M. - \ 2007
Animal Biotechnology 18 (2007)4. - ISSN 1049-5398 - p. 251 - 261.
carcass composition - porcine genome - linkage map
Apolipoprotein B (APOB) serves an essential role in the assembly and secretion of triglyceride-rich lipoproteins and lipids transport. This study was designed to clone the full-length cDNA of the chicken APOB gene, to characterize the expression profile, and investigate the differential expression between layer and broiler of the chicken APOB gene. The full-length cDNA sequence (14,150-bp) that contained a 13,896-bp ORF encoding 4,631 amino acids was obtained by RT-PCR, RACE, and bioinformatics analysis. qReal-Time PCR analysis showed that the chicken APOB gene was highly expressed in kidney, liver, and intestine. The results of differential expression showed that the APOB gene was more highly expressed in intestine and kidney in Bai'er layer than in broiler, but there was no significant difference in liver between the two breeds. The results of this study provided basic molecular information for studying the role of APOB in the energy transportation in avian species.
The Genetics of Pork Quality
Wijk, H.J. van - \ 2006
Wageningen University. Promotor(en): Martien Groenen, co-promotor(en): Henk Bovenhuis. - [S.l.] : S.n. - ISBN 9789085045045 - 176
varkens - varkensvlees - vleeskwaliteit - karkassamenstelling - genetica - genetische parameters - loci voor kwantitatief kenmerk - genoomanalyse - genkartering - merkers - pigs - pigmeat - meat quality - carcass composition - genetics - genetic parameters - quantitative trait loci - genome analysis - gene mapping - markers
This thesis describes the genetics of carcass composition and pork quality traits. A large population of commercial finishers was extensively phenotyped for growth, carcass composition and meat quality traits. Genetic parameters were estimated based on those measurements. The population was genotyped using 73 microsatellite markers covering approximately 50 percent of the genome. The covered genome regions were pre-selected based on published QTL for carcass composition and meat quality traits that were mainly obtained from divergent crosses. Significant evidence for QTL was obtained. Although with chromosome-wise significance values of 5% the obtained evidence was not very strong despite the large population size. Additional half-sib families and markers were typed to validate and further investigate the map position of QTL identified in regions on chromosomes 2, 4, 11, 13 and 14. A variance component (VC) analysis method using linkage and linkage disequilibrium was applied to further characterize and refine the map position of the QTL. The results were compared with results obtained by the classic regression analysis method. The VC analysis results reveal the considerable contribution of the dam haplotypes to the variance of meat quality traits. An accurate positioning of the QTL however was not yet possible with the marker density so far. Therefore, new microsatellites were developed by in silico analysis of BAC-end sequences (BES) of BACs on the porcine physical map and genomic shotgun sequences. This resulted in the identification of thousands of new markers covering the porcine genome with over 200 new markers in the region of interest on SSC4. The ~200 markers were tested and resulted in ~60 markers that were informative and used in an effort to further fine mapping of the QTL on SSC4.
Cortisol-binding globulin and meat quality in five European lines of pigs
Geverink, N.A. ; Foury, A. ; Plastow, G.S. ; Gil, L. ; Gispert, M. ; Hortós, M. ; Font I Furnols, M. ; Gort, G. ; Moisan, M.P. ; Mormède, P. - \ 2006
Journal of Animal Science 84 (2006)1. - ISSN 0021-8812 - p. 204 - 211.
different halothane genotypes - quantitative trait loci - pituitary-adrenal axis - large-white - carcass composition - muscle metabolism - anesthetized pigs - urinary cortisol - pregnant sows - stress
The gene (Cbg) encoding cortisol-binding globulin (CBG) has been proposed as a candidate gene to explain genetic variation in cortisol secretion and carcass composition in pigs. The objective of this study was to evaluate the association between CBG and pork quality in 5 European breeding lines, Pietrain, Large White (LW), and Landrace purebred lines, a Duroc synthetic line, and a Meishan (MS) x LW advanced intercross. Cortisol-binding globulin maximum binding capacity (CBG-Bmax) was twice as high (P <0.05) in MS x LW pigs compared with the other lines. There was no (P > or = 0.364) association between CBG-Bmax and carcass quality traits in Pietrain gilts, but CBG-Bmax was associated with increased loin yields in LW (P = 0.010) and Landrace (P = 0.103) gilts, decreased ham yields (P = 0.082) in Duroc gilts, and increased fat depth (P = 0.064) and leaf fat (P = 0.001) in MS x LW gilts. There was no association between CBG-Bmax and pork quality traits in Pietrain (P > or = 0.269) and Duroc (P > or = 0.114) gilts. Conversely, CBG-Bmax was associated with lighter (higher L* values; P <0.05) pork in Land-race gilts, as well as lower (P
Genetic improvement for production and health in broilers
Zerehdaran, S. - \ 2005
Wageningen University. Promotor(en): Johan van Arendonk, co-promotor(en): Liesbeth van der Waaij. - [S.l.] : S.n. - ISBN 9789085042648 - 125
vleeskuikens - genetische verbetering - genetische parameters - lichaamsvet - karkassamenstelling - leeftijd - huisvesting, dieren - ascites - vleeskuikenresultaten - diergezondheid - broilers - genetic improvement - genetic parameters - body fat - carcass composition - age - animal housing - ascites - broiler performance - animal health
The objective of present thesis was to optimize the genetic improvement of production and health traits in broilers. The genetic correlations among abdominal, subcutaneous, and intramuscular fat showed that there is a high genetic correlation between abdominal and subcutaneous fat (0.54), whereas the genetic correlation between abdominal and intramuscular fat is almost zero (0.02). Therefore selection for reduced abdominal fat does not change the intramuscular fat content and consequently meat quality. The genetic correlations were estimated on broilers of different ages (48, 63, and 70 d). The results indicated that increase in growth at 48 d was accompanied by increase in valuable parts (breast meat and back half); at 70 d it was accompanied by an increase in abdominal fat percentage. In addition, the genetic correlation of BW at 48 d between individual cage and group housing demonstrated a genotype by environment interaction for performance of birds in different housing systems. The present research showed that including indirect carcass measurements in the broiler breeding schemes resulted in improved genetic gain for breast meat percentage and reduced rate of inbreeding, which is desirable for long-term selection. The improved genetic gain resulted from increased accuracy of selection due to the own performance of selection candidates for carcass traits. The reliability of the indirect measurements influences the usefulness of these methods. The correlation between BW and ascites related traits in the cold conditions were estimated using mixture model analysis. The results indicated that the overall correlations between BW and ascites traits are dependent on the relative frequency of ascitic and non-ascitic birds in the population. Finally, estimated genetic parameters for production and health traits were used in a simulation to illustrate the consequences of including health related traits together with production traits in a sustainable breeding program. The results showed that a reduction of 6% of response in production traits was sufficient to offset the negative response in health traits.
Sturen op karkaskwaliteit in biologische 'mini'keten
Enting, I. - \ 2003
Praktijkkompas. Varkens 17 (2003)3. - ISSN 1570-8578 - p. 23 - 23.
varkenshouderij - varkens - slachtdieren - biologische landbouw - karkaskwaliteit - karkassamenstelling - mestresultaten - prestatieniveau - prestatie-onderzoek - landbouwkundig onderzoek - dierveredeling - varkensvoeding - ketenmanagement - varkensfokkerij - pig farming - pigs - meat animals - organic farming - carcass quality - carcass composition - fattening performance - performance - performance testing - agricultural research - animal breeding - pig feeding - supply chain management - pig breeding
Het ideale biologische vleesvarken heeft, net als het gangbare varken, een geslacht gewicht van minimaal 90 kg en een magervleespercentage van minimaal 55 %. Op het Praktijkcentrum voor de biologische varkenshouderij in Raalte onderzoeken we de invloed van de keuze van de eindbeer en de kracht- en ruwvoeropname op de vlees/vet-verhouding in het karkas van biologische varkens
Bij rustige boer houden varkens energie over
Mheen, H. van der; Spoolder, H.A.M. - \ 2003
Praktijkkompas. Varkens 17 (2003)3. - ISSN 1570-8578 - p. 4 - 5.
varkenshouderij - varkens - dierenwelzijn - agrarische bedrijfsvoering - gedrag - abnormaal gedrag - houding van boeren - prestatieniveau - mestresultaten - karkasgewicht - karkassamenstelling - groei - pig farming - pigs - animal welfare - farm management - behaviour - abnormal behaviour - farmers' attitudes - performance - fattening performance - carcass weight - carcass composition - growth
Varkenshouders gaan dagelijks met hun dieren om. De manier waarop ze dit doen verschilt. De vraag is of dit iets uitmaakt. Veel mensen zijn van mening dat de manier van omgang wel degelijk een invloed heeft.
|Nederland kiest voor voordelen van visionsysteem: classificatiesystemen en toekomstige ontwikkelingen
Walstra, P. ; Lambooij, E. - \ 2002
Vleesindustrie 8 (2002)10. - ISSN 1385-7312 - p. 26 - 29.
classificatie - karkassen - karkassamenstelling - karkasbeoordeling - karkaskwaliteit - computertechnieken - afbeelden - beeldverwerkers - machine vision - classificatiesystemen - classification - carcasses - carcass composition - carcass grading - carcass quality - computer techniques - imagery - image processors - classification systems
Visiontechnieken zijn de meest recente apparatuur om varkenskarakassen te classificeren en volledig automatisch te beoordelen
|Geen invloed op technisch resultaat : vergelijkende proef met wel en niet uitladen
Middelkoop, J.H. van; Harn, J. van; Wiers, W.J.W. - \ 2001
De Pluimveehouderij 31 (2001)23. - ISSN 0166-8250 - p. 12 - 13.
pluimveehouderij - vleeskuikens - pluimveevoeding - prestatieniveau - groei - voederconversie - karkassamenstelling - poultry farming - broilers - poultry feeding - performance - growth - feed conversion - carcass composition
Cijfers Europorc onderstrepen belang lagere kostprijs en nieuwe markten
Kuunders, L. ; Mandersloot, F. - \ 2000
Praktijkonderzoek varkenshouderij 14 (2000)1. - ISSN 1382-0346 - p. 16 - 17.
varkensvlees - kostenanalyse - dierlijke producten - nederland - vergelijkingen - europa - varkenshouderij - varkens - prestatieniveau - karkassamenstelling - pigmeat - cost analysis - animal products - netherlands - comparisons - europe - pig farming - pigs - performance - carcass composition
De varkenshouderij in Nederland behaalde in 1996 en 1997 ten opzichte van andere EU-landen goede technische resultaten, maar de kostprijs van een kg varkensvlees was in Nederland hoger dan in Denemarken en Frankrijk, de belangrijkste concurrenten. Ookscoorde Nederland met het resultaat van de opbrengstprijs minus kostprijs slechter dan de meeste EU-landen.
|Mooi voor de mester, slecht voor de slachter : drie dag-nachtschema's vergeleken met continu licht
Harn, J. van; Middelkoop, J.H. van - \ 1999
De Pluimveehouderij (1999)16. - ISSN 0166-8250 - p. 14 - 15.
vleeskuikens - vleesproductie - lichtregiem - dierenwelzijn - productiviteit - karkassamenstelling - bedrijfsresultaten in de landbouw - rentabiliteit - broilers - meat production - light regime - animal welfare - productivity - carcass composition - farm results - profitability
Resultaten van een onderzoek naar het effect van verschillende dag-nachtschema's op de productieresultaten, slachtrendement en welszijn van vleeskuikens
Het effect van rogge in vleesvarkensvoer op technische en financiele resultaten
Krimpen, M. van; Plagge, G. ; Scholten, R. - \ 1999
Praktijkonderzoek varkenshouderij 13 (1999)6. - ISSN 1382-0346 - p. 12 - 13.
groeistudies - varkensvoeding - groeitempo - karkassamenstelling - varkensvlees - rentabiliteit - rogge - tarwe - voederconversievermogen - growth studies - pig feeding - growth rate - carcass composition - pigmeat - profitability - rye - wheat - feed conversion efficiency
Wat de technische resultaten betreft kan tarwe in vleesvarkensvoeders tot een niveau van 45% goed uitgewisseld worden tegen rogge. Het overschakelen van startvoer naar vleesvarkensvoer dient geleidelijk te verlopen om te voorkomen dat de mestconsistentie tijdelijk verslechtert.
Los of in het mengvoer verstrekken van 50% tarwe en gerst aan vleesvarkens
Scholten, R. ; Rijnen, M. ; Plagge, G. - \ 1999
Praktijkonderzoek varkenshouderij 13 (1999)1. - ISSN 1382-0346 - p. 20 - 21.
varkens - varkensvoeding - mengvoer - tarwe - gerst - voer - voedingswaarde - verteerbaarheid - groei - ontwikkeling - karkassamenstelling - bedrijfsresultaten in de landbouw - pigs - pig feeding - compound feeds - wheat - barley - feeds - nutritive value - digestibility - growth - development - carcass composition - farm results
Vleesvarkens die 50% tarwe en gerst los verstrekt krijgen in combinatie met een aanvullend mengvoer hebben een ongunstigere EW-conversie dan vleesvarkens die 50% tarwe en gerst in het mengvoer verstrekt krijgen. De groei en het mager-vleespercentage zijn niet aantoonbaar verschillend tussen beide groepen.
Meer oppervlak geeft betere groei bij vleesstieren
Ruis-Heutinck, L. ; Heeres-van der Tol, J. ; Smits, M. ; Smits, D. - \ 1999
Praktijkonderzoek Rundvee, Schapen en Paarden. Praktijkonderzoek 12 (1999)4. - ISSN 1386-8470 - p. 27 - 29.
stieren (bulls) - vleesproductie - huisvesting, dieren - bezettingsdichtheid - vloeren - dierenwelzijn - karkassamenstelling - bulls - meat production - animal housing - stocking density - floors - animal welfare - carcass composition
Hoeveel ruimte hebben de stieren uit welzijnsoogpunt nodig en leidt dat tot betere prestaties? En geeft een zacht ligbed een verbetering van het welzijn?