Increase in live weight and meat productivity of young fat-tailed sheep breeds by crossing

The research was carried out in a herd of the Saryarka fat-tailed coarse-wooled sheep breed, where rams of the Edilbay breed were used on the second class ewes, and in a herd of the Kazakh fat-tailed semi-coarse-wooled sheep breed, where rams of the Saryarka fat-tailed coarse-wooled breed were used on the second class ewes. The level and dynamics of live weight were studied in the resulting off spring for the suckling period and up to 16 (rams) and 18 (ewes) months of age.

In terms of live weight for all studied age periods, the superiority was observed in crossbred lambs and young animals, it was 4.0-4.2% in E × SFC-S hybrids at birth (rams-ewes), while slaughtering 7.5-5, 1% (P > 0.999), at 16 months (rams) – 14.0% (P > 0.999) and at 18 months (ewes) – 6.5% (P > 0.999); for hybrids SFC-S × KFS-K – 4.2-4.3%; 7.1-6.3% (P > 0.999); 6.1% (P > 0.999) and 6.9% (0.999), respectively.

Crossbred lambs and young animals grew and developed more intensively, their average daily gain in the suckling period for the rams of E × SFC-S variant was 280 g and for SFC-S × KFS-K variant – 260 g versus 259 and 242 g in purebred peers, respectively. These indicators for ewes were 251, 241 and 238, 226 g, respectively. The average daily gain in live weight of rams in the period from slaughtering to 16 months of age was 75 g in the E × SFC-S variant, and in the SFC-S × KPG-K variant – 60 g versus 60 and 57 g, respectively, in their purebred peers. In the ewes group, these indicators were 45, 40 and 40.37 g, respectively.

While slaughtering at four months of age, the slaughter yield in the E × SFC-S variant was 52.8%, in the SFC-S × KFS-K variant – 52.3% versus 52.1 and 51.6% respectively in the control variants. The pulp yield was also higher in crossbred rams than in their peers from the control groups – 80.2-79.3 and 79.1-79.2%, respectively. Similar results were obtained during the slaughter of crossbred and pure-bred rams of the above-menthioned groups at 16 months of age.

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