Abstract
The energy required during gestation in sheep is high, and when restricted, fetal development may be affected; thus, knowledge of its deficit needs to be better understood. The objective was to evaluate different levels and sources of energy in the diet of sheep and their influence on the viscera and carcass yield of the offspring. The experiment was carried out at the Faculty of Animal Science and Food Engineering of USP, Brazil, using 56 pregnant ewes, Dorper and Santa Ines breeds, randomly distributed in four treatments: control group (fed according to the 2007 NRC recommendation); and groups with 10% more energy with different sources (starch, ST; protected fat, PF; and chromium, Cr). Ewes were fed the experimental diets at the beginning (50 days) and end of the gestation (50 days). The middle of gestation the ewes received the diet as recommended by the NRC (2007). After weaning at 60 days, 32 uncastrated male lambs were confined for a period of 60 days. In the confinement the lambs received a growth diet, being the same for all the animals. After this period, lambs were slaughtered, and the non-carcass components were weighed, the warm and cold carcass yields were calculated. The experimental design was completely randomized, with eight replicates and four treatments, the means were analyzed by orthogonal contrasts, assuming a significant threshold of 5%. Lambs in the PF treatment had lower cold carcass yield (50.8%, PPP > 0.05). The sheep fed according to the energy recommendation had lambs with greater weight of omental fat, testicular, kidney and rumen. These lambs also had a smaller spleen, heart, liver, and intestine. We concluded that the maternal diet affected the growth and development of progeny by altering the viscera and the carcass yields. Acknowledgment to FAPESP (process 2017/20555–8).
NUTRITIONAL STUDIES ON SOME DIFFERENT SOURCES AND LEVELS OF IODINE ON PRODUCTIVE PERFORMANCE, RUMINAL FERMENTATION AND BLOOD CONSTITUENTS OF BUFFALO. 3-EFFECT OF DIFFERENT LEVELS OF IODINE ON PRODUCTIVE PERFORMANCE OF BUFFALO CALVES.
