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Genetic and phenotypic relationships between embryonic loss and 305-day milk yield traits [electronic resource].

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Abdelharith, Hanaa

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Language: English Summary language: Arabic Description: p.27-55Other title:

العلاقات الوراثية والمظهرية بين صفتى الفقد الجنينى وانتاج اللبن فى 305 يوم [Added title page title]

Uniform titles:

Proceedings of the 1st scientific congress [electronic resource]:

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ART ESAMP No1 3

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Full Text Article.

In: Proceedings of the 1st Scientific Congress:the role of veterinary medicine in animal, and poultry, and fish wealth development : Giza, Egypt 30 -31 October, 2006Summary: Embryonic loss (L) and 305-day milk yield (M)traits were analyzed using GIBBS Sampling Program. Variance components, heritability of the two traits and genetic and phenotypic correlation coefficients between them were estimated for cows and heifers using 3200 records of 1553 Friesian cows. The animals were raised at the Animal Production Re¬search Stations at Sakha and EI-Karada of the Animal Production Re¬search Institute, Ministry of Agriculture. Egypt. Data covered the period from 1979 to 2000. The statistical model included four fixed effects, farm. parity, year and season of calving for the two traits. It also included the random effect of animal. Heritability estimates for the two traits (L and M) were 0.60 and OJ 5 for cows and were 0.82 and 0.20 for heifers, respectively. Genetic and phenotypic correlation coefficients between the two traits were -0. J 0 and -0.29 for cows and were 0.02 and -0.07 for heifers, respectively. The results support the findings of previous studies which indicated that genetic factors are major cause of embryonic loss and that milk production is adversely correlated with the embryonic loss in lactating dairy cows.

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Embryonic loss (L) and 305-day milk yield (M)traits were analyzed using GIBBS Sampling Program. Variance components, heritability of the two traits and genetic and phenotypic correlation coefficients between them were estimated for cows and heifers using 3200 records of 1553 Friesian cows. The animals were raised at the Animal Production Re¬search Stations at Sakha and EI-Karada of the Animal Production Re¬search Institute, Ministry of Agriculture. Egypt. Data covered the period from 1979 to 2000. The statistical model included four fixed effects, farm. parity, year and season of calving for the two traits. It also included the random effect of animal. Heritability estimates for the two traits (L and M) were 0.60 and OJ 5 for cows and were 0.82 and 0.20 for heifers, respectively. Genetic and phenotypic correlation coefficients between the two traits were -0. J 0 and -0.29 for cows and were 0.02 and -0.07 for heifers, respectively. The results support the findings of previous studies which indicated that genetic factors are major cause of embryonic loss and that milk production is adversely correlated with the embryonic loss in lactating dairy cows.

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