INFLUENCE DU TAUX D'HYDRATATION DU RÉGIME SUR LA CROISSANCE ET LA COMPOSITION CORPORELLE DU PORC

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Abstract
Experiments studying influence of diet consumption with low dry matter content on growth and body composition of pigs were made. Diets had or had not a large proportion of dried whey. They were given to appetite or in a system of paired feeding, and they had ratio of water to dry matter 3:1 or 6:1. The effect of diluting the ration with a large amount of water, 6 liters/kg feed, differed according to the nature of the feed. When the feed was based on cereals and oilcakes growth rate, daily feed intake and fatness of the carcass were markedly reduced, without any change in efficiency of feed utilization. When the feed had a high proportion of dried whey, the excess water no longer caused any noticeable reduction in growth rate except in cases where the animals were not first adapted to the system. There was still a reduction in fatness, but less marked. Utilization of whey for feeding pigs is limited by its high content of water. Effect of excess water on intake of feed influences growth rate; in fact the differences previously shown disappeared when intake is kept the same for pigs given large amounts of water and for those given an amount which was considered normal. Moreover, the efficiency of utilization of the ration is not altered by the degree of dilution; the same applies to the digestibility and utilization of the nitrogen.

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