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The study presents a comparison of ovulation rate (CL number) and litter size between pure Booroola (BB) and their reciprocal crosses (F1 and F2) with Olkuska sheep. As these breeds express a high reproduction potential and in the same time differ significantly in other performance traits affecting lamb production, it was assumed that their crosses might combine beneficial characteristics of both...
The experiment was conducted on 150 Polish Merino ewes divided into six groups. Three groups consisted of 2-year-old ewes, before their first lambing and three groups of the 3-year-old ewes after the first lambing. Within each age category, one group of ewes was treated with 5ml 0.1% sodium selenate and 250mg vitamin E while the third one was a control group. The effect of i.m. injection of Se and...
The investigations were conducted on 75 ewes before first lambing and 75 ewes after first lambing, and covered the effect of i.m. injections of Ca and Mg on fertility, prolificacy, number of lambs reared and the live weight of lambs at birth and at the age of 28 days. The blood plasma was sampled twice before injections and the mean Ca concentrations in 2-year-old animals were 2.27 and 2.02 mmol...
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