Co-Authors:
Gootwine, E., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O.B. 6, Bet Dagan 50 250, Israel
Goot, H., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O.B. 6, Bet Dagan 50 250, Israel
Abstract:
Data on lambs born per ewe put to the ram (LB/EP), lambs born per ewe lambing (LB/EL), milk production through lactation and lactation length up to six lambings of 603 Awassi (A), East-Friesian (EF), A × EF (F1), F1 × F1 (F2), EF × F1 (1/4A), 1/4A × F1 (3/8A1) and 3/8A1 × 3/8A1 (3/8A2) ewes bred in the same flock in the years 1956-1971 were analysed. The data were obtained from 2293 ewe-years, 1993 lambings and 1698 lactations. Genotype, age at lambing and sire within genotype had an (P < 0.05) effect on each trait. Effect of year of birth, genotype by age at lambing interaction and genotype by year of birth interaction were significant (P < 0.05) for milk production but not for lamb production. The effects of litter size on milk yield and lactation length were not significant. Least squares means (LSM) of LB/EP were highest in 3/8A2 (1.48) and lowest in Awassi (0.98). LSMs of LB/EL were highest in EF (1.60), and lowest in Awassi (1.11). The LSMs of milk yield of A, F1, F2 and 3/8A2 were similar, ranging from 223 to 248 1. The milk yield of EF was the lowest: only 161 1. The LSMs for lactation length were similar in all genotypes, about 198 days except for 1/4A and EF which had shorter (P < 0.05) lactations. The Awassi-transmitted effects were positive (P < 0.001) for lactation length and milk yield, and negative (P < 0.001) for LB/EL. Heterosis (P < 0.001) was found for LB/EL, milk yield and lactation length. Recombination effect was not significant for any trait.
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מונוכרום
הדגשת קישורים
חסימת אנימציה
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