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Comparative digestibility of energy and nutrients in growing pigs fed ad libitum and adults sows fed at maintenance



Comparative digestibility of energy and nutrients in growing pigs fed ad libitum and adults sows fed at maintenance



Livestock Production Science 34(1-2): 137-152



Fourteen diets which differed widely in their chemical composition were fed to adult sows at a maintenance energy level (390 KJ ME/kg BW-0.75) and to 43 BW growing pigs at a feeding level close to their ad lib intake (1930 KJ ME/kg BW-0.60). These two groups of animals and the corresponding nutritional conditions represent two extreme situations in which digestibility of nutrients should be maximum and minimum, respectively. The results showed that the sows had superior capacity to digest energy or nutrients. The digestibility coefficients of energy, crude protein, ether extract and NDF were 84.7, 85.2, 69.1 and 70.9% for sows and 75.8, 74.8, 55.5 and 50.2% for growing pigs, respectively. On the other hand, the ME:DE ratio was lower in sows (92.4 vs 96.5%) in connection with higher energy losses in the urine (6.45 vs. 3.1% of DE intake) and as methane (1.34 vs. 0.44% of DE intake). The difference in DE values (on average, 1.6 MJ per kg dry matter) or ME values (on average, 0.9 MJ per kg dry matter) between sows and growing pigs was not constant but increased with dietary NDF content. The greater depressive effect NDF on energy digestibility in growing pigs was related to their lower ability to digest cell wall fractions and to the more negative effect of NDF on apparent digestibility of other dietary nutrients (crude protein and crude fat). Equations or predicting nutritive values of sow diets from those measured in growing pigs are given.

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Accession: 008349010

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DOI: 10.1016/0301-6226(93)90042-g


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