Download Genetics of Reproduction in Sheep by R. B. Land, D. W. Robinson PDF

By R. B. Land, D. W. Robinson

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Sample text

Eikje and Steine (1976) also looked at the realized selection differentials and generation intervals to see how they correspond with the realized genetic gain. 0076 per year, respectively. Consequently, the estimate for number of lambs born is in good agreement with the 52 Genetic studies of reproduction in Norwegian sheep expectation but the estimate for number of lambs weaned is much greater. There are at least two possible explanations: (1) The estimate of genetic gain may be imprecise. (2) Eikje (1975a) found a positive genetic correlation between weaning weight as a ewe trait and number of lambs at weaning.

Of these, 3061 were F3 and F4 crossbreds, 756 Berrichon and 1321 Romanov. The analysis included the sex, birth weight and type of birth. 2. 3. 2). 7 kg) than those born to adult mothers. Single-birth lambs have the maximum weights, while lambs born and raised as twins or triplets have the lowest weights and weight gains. The lambs on artificial rearing have a good average daily gain between 10-30 days (259 vs 205 g for the 2,2 class) but a poor average daily gain between 30-90 days (245 vs 297 g), and thus they have the lowest weight at 90 days.

Realized genetic gain 51 The experiment is being carried out at two research stations; Rosendal in Hordaland county and Tj0tta in Nordland county. 5 lambs based on at least 3 years' lambing records. 65 lambs. At both research stations there has been a control group of Dala ewes. The number of ewes in the selected groups is 70-90 and in the control groups 50-60 at each station. There are five rams used in each group, most of which have been used for 1 or 2 years. 2 lambs above the control groups.

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