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Analysis of some genetic and environmental factors affecting birth weight and growth to 3 months in Romney Marsh lambs



Analysis of some genetic and environmental factors affecting birth weight and growth to 3 months in Romney Marsh lambs



Veterinaria, Mexico 9(3): 120



An analysis was carried out on data recorded on 606 Romney Marsh lambs, born in Mexico in 1976-77, of which 15.1% were twins. Body weight at birth and at 1, 2 and 3 mth of age averaged 4.4, 10.2, 13.9 and 16.8 kg resp., males being significantly heavier than females at all ages, and singles being significantly heavier than twins. Body weights of lambs born in Mar. and Apr. were superior to those of lambs born at other times. The h2s of body weight at the various ages were 0.30-0.41.

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