Fattening and slaughter qualities of lambs under conditions of use in their diets of feeds with different degrees of cleavage in the rumen of protein

Abstract

Materials of scientific and experimental studies are indicated, which indicate certain differences in the formation of productive qualities of young Askani sheep of fine-wooled breed during intensive fattening when consuming rations consisting of feed where protein had different degrees of cleavage in the rumen. It was found that when using for feeding lambs II experimental group rations similar in amount of crude protein, but not the same in the level of digestibility of protein fractions (31% of undigested protein versus 23% in control of total concentration) increased by 5.7% of their mercury weight at the age of 6.5 months, when the animals reached slaughter condition. This difference is primarily due to the better biotransformation of feed nutrients (7.4 ECO / kg growth versus 8.0 ECO / kg control) and high growth rate, which was 12.9% higher in young sheep of experimental group II (201 g / goal / day against 178 g / goal / day in control).
 When correcting the consumption of protein fractions digestible in the rumen, the carcass quality was improved in experimental lambs, namely by 5.7% of carcass weight (20.3 kg vs. 19.2 kg in the control) and 0.6 abs. % Of carcass yield (47, 3% vs. 46.7% in control).
 Morphological evaluation of animal carcasses showed that the optimization of protein norms by the degree of its cleavage in the rumen contributed to an increase in young sheep of the II experimental group by 1.7 abs. % (74.4% vs. 72.7%) of muscle tissue yield due to decreased bone and tendon mass. In view of this, the sheep of this group was larger by 0.25 units. meat content ratio (2.91 units vs. 2.66 units in the control). , 44 kg vs. 9.52 kg in control) while improving its biological and nutritional value.