Variability of farm animals during the embryonal and postembryonal periods under the influence of different feeding regimes Heredity and variability of plants, animals, and microorganisms

Pshenichnyi, P.D.

Akad Nauk Sssr Moscow 1: 197-211

1959


Accession: 026070034

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Abstract
Abundant feeding of sows at the beginning of pregnancy induced in the progeny improved food digestion, better nitrogen utilization, intensified gas exchange, and a more intensive growth as compared with the progeny of sows which were moderately fed during the first half of their pregnancy. The progeny of sows fed for 3-4 generations rations very rich in concentrates showed substantial differences from that of sows fed with rations of moderate content of concentrates. The differences were mainly in the mean coefficient of digestibility of feeds, in the coefficient of deposition of digestible N, in the potential and actual fertility, and in the sizes of the embryos' internal organs. These differences also appeared when sows from both experimental groups obtained identical rations during the entire period of pregnancy. At the same time, no chemical changes in the composition of the embryos' body were observed. In rabbits, however, a statistically reliable difference was observed in the fat content of the newborn, when their mothers were fed with different types of rations during 3 generations; this may be due to different stages of maturing of pig and rabbit young at birth. With the excessive addition of either proteins, fats, or carbohydrates to the ration of pigs, the digestibility of the most abundant constituent of food of growing pigs rose, while that of other organic nutrients remained without change or dropped. Another way out of the harmful influence of an excessive flow of nutrients was an increase in their deposition in the body.