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.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 401986
Title Effects of ambient temperature and soybean meal supplementation on intake and digestion of two sheep breeds differing in mature size
Author(s) Lourenço, A.L.; Cone, J.W.; Fontes, P.; Dias-Da-Silva, A.
Source Journal of Animal Physiology and Animal Nutrition 94 (2010)5. - ISSN 0931-2439 - p. 571 - 583.
Department(s) Animal Nutrition
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) feed-intake - gastrointestinal-tract - ewe milk - apparent digestibility - particle distribution - voluntary intake - air-quality - dry-matter - rumen - passage
Abstract The aim of this study was to compare the intake and digestive physiology of mature ewes of two breeds - Ile-de-France (mature weight: 75–80 kg) and Churra-da-Terra-Quente (CTQ; mature weight: 45–50 kg) - and evaluate the effects of ambient temperature and protein supplementation in the comparison. The temperature (25 °C vs. 11 °C) and soybean meal supplementation (150 g/kg of ingested hay on dry matter basis vs. unsupplemented control) were evaluated in 48 adult ewes of two breeds fed hay ad libitum and at a restricted level of intake. The intake, digestibility, rumen pH and NH3–N, rumen outflow rates, faeces particle size and thyroid hormones levels were measured. These hormones can be related with gastrointestinal motility, thus explaining rumen outflow rate patterns. Dry matter intake per kg of body weight was higher in CTQ ewes (p <0.05). This breed also exhibited lower organic matter and neutral detergent fibre digestibility (p <0.001) and higher solid (p <0.001) and liquid (p <0.01) rumen outflow rates irrespective of intake level, supplementation or temperature. Rumen pH remained above 6.6 in all treatments. NH3–N rumen content was similar (p > 0.05) when breeds were fed only hay. There was no breed effect (p > 0.05) on faeces particle size. Triiodothyronine was not affected (p > 0.05) by breed and thyroxine was higher (p <0.10) in the CTQ breed but only at the lower temperatures (breed × temperature, p <0.05). Ile-de-France sheep showed a lack of adaptation to lower temperatures. This study suggests that the native CTQ breed fulfils its metabolic needs by having a higher intake and inherits faster flow through the gastrointestinal tract, as a result, its digestive ability is diminished.
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