Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Response of saliva Na/K ratio to changing Na supply of lactating cows under tropical conditions
Thiangtum, Wandee ; Schonewille, Thomas J. ; Verstegen, Martin W.A. ; Arsawakulsudhi, Supot ; Rukkwamsuk, Theera ; Hendriks, Wouter H. - \ 2017
Journal of the Science of Food and Agriculture 97 (2017)8. - ISSN 0022-5142 - p. 2480 - 2486.
Lactating cows - Saliva Na/K - Sodium - Tropical conditions
BACKGROUND: Factorial determination of the sodium (Na) requirement of heat-stressed lactating cows is hindered by accurate estimates of the Na losses through sweat. Direct studies, therefore, may be needed requiring information on the time course of healthy animals to become Na depleted and the subsequent rate of repletion. The rate of Na depletion and subsequent rate of Na repletion with two levels of dietary Na to lactating dairy cows housed under tropical conditions were investigated using the salivary Na/K. RESULTS: The 12 lactating cows (salivary Na/K ratio 14.6) rapidly developed clinical signs of Na deficiency, including pica, polyuria and polydipsia, reduced body weight and reduced milk yield when fed a low-Na ration (0.33gkg-1 dry matter (DM)) for 3 weeks. Deficiency symptoms were associated with a rapid decrease in salivary Na/K ratio to -1 DM for 5 weeks did not restore salivary Na/K ratio to values of >6. CONCLUSION: A daily Na intake of heat-stressed lactating cows to a ration intake of 1.6g Na kg-1 DM was insufficient to restore Na deficiency. One week was sufficient to deplete heat-stressed lactating cows of Na, allowing for rapid dose-response studies utilizing the salivary Na/K ratio as a parameter for Na status of cows under tropical conditions.
Effect of dietary protein levels on rumen metabolism and milk yield in mid-lactating cows under hot and humid conditions
Thiangtum, W. ; Schonewille, J.T. ; Yawongsa, A. ; Rukkwamsuk, T. ; Kanjanapruthipong, J. ; Verstegen, M.W.A. ; Hendriks, W.H. - \ 2014
Journal of Animal and Veterinary Advances 13 (2014)1. - ISSN 1680-5593 - p. 9 - 14.
An experiment was conducted to investigate the effects of 2 levels of dietary Crude Protein (CP) in concentrates with similar proportions of Rumen Undegradable Protein (RUP) on rumen metabolism, milk yield and composition in mid lactating cows in Thailand. Eight 87.5% Holsteinx12.5% indigenous multiparous cows were used in a crossover design with two successive 25 days periods. Diets contained 30% paragrass and 70% concentrate on a Dry Matter (DM) basis. Concentrate feeds were formulated to provide low dietary CP (17.3%; LCP) or high dietary CP (19.04%; HCP). The proportion of Rumen Degradable Protein (RDP) and RUP was 61 and 39% in both diets. Diets were isocaloric in terms of net energy for lactation. Milk yield, milk lactose yield, Dry Matter Intake (DMI) and apparent digestibility of DM, CP and Neutral Detergent Fiber (NDF) were greater in cows fed HCP than in those fed LCP. Concentration of blood urea nitrogen was elevated in cows fed HCP diets. Rumen NH3-N concentration and pH tended to increase in cows fed HCP diet. Rumen microorganism counts and volatile fatty acids levels in the rumen did not differ between treatments. The increasing CP content in mid-lactating cow was beneficial to increase DMI, apparent digestibility of DM, CP and NDF and therefore milk yield.
An attempt to define the sodium requirements of lactating dairy cows in a tropical environment
Thiangtum, W. ; Yawongsa, A. ; Schonewille, J.T. ; Rukkwamsuk, T. ; Yuangklang, C. ; Verstegen, M.W.A. ; Hendriks, W.H. - \ 2011
Journal of the Science of Food and Agriculture 91 (2011)13. - ISSN 0022-5142 - p. 2333 - 2337.
acid-base status - potassium-chloride - mineral metabolism - dietary-sodium - heat-stress - responses - supplementation - magnesium - bicarbonate - absorption
BACKGROUND: Lactating dairy cattle in the tropics may require more sodium (Na) owing to the hot and humid climatic conditions. It is unknown whether the current recommendations on Na for lactating cows can be quantitatively used in tropical countries. This study attempted to define the Na requirement of lactating dairy cows under tropical conditions by measuring Na levels in saliva, milk and faeces. RESULTS: The concentrations of Na and potassium (K) in milk, faeces and serum were not affected by dietary treatments. The amount of Na absorbed by cows fed the basal (low-Na) diet containing 0.4 g Na kg-1 dry matter (DM) was equal to the amount of Na lost in the milk, showing that these animals were fed an Na-deficient ration. This observation was corroborated by salivary Na and K levels, with the cows on the low-Na diet having salivary Na concentrations below 120 mmol L-1 in combination with salivary K concentrations above 20 mmol L-1 (P <0.05). CONCLUSION: Consumption of a daily ration formulated to contain the current Na requirement set by the NRC appears to provide too much Na for lactating cows under tropical conditions. A tentative value of 1.2 g kg-1 DM is proposed as the Na requirement for dairy cows under tropical conditions. Copyright © 2011 Society of Chemical Industry
Post-partum supplementation with rumen undegradable protein not reduce fatty acid liver development in dairy cows as induced by overfeeding during the dry period
Murandot, A. ; Rukkwamsuk, T. ; Kruip, T.A.M. ; Wensing, T. ; Meijer, G.A.L. ; Beynen, A.C. - \ 2002
Journal of Animal Physiology and Animal Nutrition (2002). - ISSN 0931-2439
An investigation into the mechanism by which the negative energy balance affects the fertility and reproductive performance of the high yielding dairy cow post partum
Kruip, Th.A.M. ; Meijer, G.A.L. ; Rukkwamsuk, T. ; Wensing, T. - \ 1999
In: Proceedings 10th ICPD / Edites by Th. Wensing. - 1999. - 183-190
Relationships between overfeeding and overconditioning in the dry period and the problems of high producing dairy cows during the postparturient period
Rukkwamsuk, T. ; Kruip, T.A.M. ; Wensing, T. - \ 1999
Veterinary Quarterly 21 (1999). - ISSN 0165-2176 - p. 71 - 77.
Relationship between triacylglycerol concentration in the liver and first ovulation in postpartum dairy cows
Rukkwamsuk, T. ; Wensing, T. ; Kruip, T.A.M. - \ 1999
Theriogenology 51 (1999). - ISSN 0093-691X - p. 1133 - 1142.
Hepatic Fatty Acid Composition in Periparturient Dairy Cows with Fatty Liver Induced by Intake of a High Energy Diet in the Dry Period
Rukkwamsuk, T. ; Kruip, T.A.M. ; Meijer, G.A.L. ; Wensing, T. - \ 1999
Journal of Dairy Science 82 (1999)2. - ISSN 0022-0302 - p. 280 - 287.
The present study compared the hepatic fatty acid composition of cows that were fed a high energy diet during the dry period to induce fatty liver after parturition with that of control cows. Treated cows had higher concentrations of plasma nonesterified fatty acids as a result of greater lipolysis after parturition than did control cows; consequently, the treated cows accumulated greater amounts of triacylglycerols in the liver. Before parturition, treated cows had lower percentages of oleic acid and higher percentages of linoleic acid than did control cows, but percentages of other fatty acids were similar for both groups. After parturition, percentages of each fatty acid were changed substantially, particularly the four major fatty acids (palmitic, stearic, oleic, and linoleic acids). For treated cows, the percentages of palmitic and oleic acids were higher at 0.5 wk after parturition than at 1 wk before parturition; percentages of stearic and linoleic acids decreased. Unlike treated cows, the percentages of both oleic and linoleic acids in the control cows did not change during that time. Moreover, we found that when lipolysis decreased, as indicated by lower plasma nonesterified fatty acid concentrations, the percentages of each fatty acid gradually rebounded toward the concentrations measured before parturition; this observation indicates that the shift in hepatic fatty acid composition is influenced by lipolysis. The increased lipolysis after parturition led to a vast increase in the hepatic triacylglycerol concentration and to a shift in hepatic fatty acid composition.
Effects of feed in the dry period on fertility of dairy cows post partum
Kruip, T.A.M. ; Meijer, G.A.L. ; Rukkwamsuk, T. ; Wensing, T. - \ 1998
Reproduction in Domestic Animals 33 (1998)3-4. - ISSN 0936-6768 - p. 165 - 168.
It has been hypothesized that the decrease in fertility of dairy cows is related to the increase in milk yield and associated with fatty liver and increased vulnerability for both infection and metabolic diseases. To elucidate the mechanisms behind this complex of health and reproductive problems an Animal Model, based on overfeeding in the dry period, has been developed. In an experiment carried out in 1996 sixteen animals were fed 119 MJ/d net energy to lactation (NEL) (experimental group) and another sixteen just 49 MJ/d NEL (control group) in the last 8 weeks before parturition. During lactation the cows from both groups were given the lactation ration ad libitum. After parturition both groups differed significantly in level and duration of the NEB, in weight loss, increased concentrations of NEFAs and bHBB in the blood and TAG in the liver. Although the insulin level was lower in the experimental animals during the first week, the difference was not significant. The number of ovulations within the first 100 days pp was significant lower in the experimental group and was related to depth and duration of the NEB and the weight loss: more NEB leads to less ovulations. The interval partus-le ovulation was also significant different but related to the TAG level in the liver: more TAG leads to a longer interval. The experimental group with the fatty liver suffered more incidenses of metabolic diseases. It has been concluded that the Model leads to a severe NEB, to Fatty Liver and to more incidences of diseases. Both the NEB and the fatty liver influence the fertility of the cows pp and it can not be excluded that some diseases have an effect too. More studies are planned to unravel the factors that affect the fertility of high yielding cows.
An investigation into the mechanism by which the negative energy balance affects the fertility and reproductive performance of the high yielding dairy cow post partum
Kruip, T.A.M. ; Meijer, G.A.L. ; Rukkwamsuk, T. ; Wensing, T. - \ 1998
In: Proceedings 10th international congress on production diseases (ICPD), 1998 - p. 78 - 78.
The effect of supplementation with non degradable protein to high producing dairy cows postpartum on triacylglycerol (TAG) accumulation in the liver
Murondoti, A. ; Rukkwamsuk, T. ; Tivapasi, M.T. ; Kruip, T. ; Wensing, T. - \ 1998
In: Proceedings 10th international congress on production diseases (ICPD), 1998 - p. 116 - 116.
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