Effects of dietary spray-dried bovine plasma protein on broiler growth performance and breast-meat yield.

摘要

Dietary spray-dried plasma protein (SDPP) is effective in improving the growth performance of swine raised in unsanitary conditions. However, little is known about the efficacy of SDPP in improving chicken growth performance and carcass characteristics. In this study, graded levels of bovine SDPP (0-2% of the diet) were fed to male chickens (Ross 308) from 1 to 42 days of age. 2 experiments with identical designs were conducted, each with 480 chickens. Chickens in the 2nd experiment were raised on the soiled litter from the 1st experiment, thereby creating 2 environments with different levels of sanitation. Chickens fed the control diet in experiment 2 had higher mortality, lower rate of body wt. gain and were less uniform than those fed the control diet in experiment 1. This suggested that reusing the soiled litter in experiment 2 resulted in a relatively more unsanitary environment. Dietary bovine SDPP did not affect growth performance, carcass wt., dressing percentage or leg, wing and breast meat yields (as a percentage of carcass wt.) in the 1st experiment, but improved growth rate, feed conversion, breast meat yield (as a percentage of carcass wt.) and flock uniformity of chickens in the 2nd, more unsanitary, experiment. It is concluded that dietary SDPP, fed throughout the growth period, may improve the growth performance and breast-meat yield of chickens raised in an unsanitary environment.