The effect of some factors on stillbirth in primiparous and multiparous Holstein cattle in Iraq

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rashad firas
rashad firas
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Dr. Firas Rashad Al-Samarai
Dr. Firas Rashad Al-Samarai
1 University of Al-Nahrain/Iraq

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A total of 9691 records of calves belonged to 3076 Holstein cows and 58 sires were analyzed from 1995 to 1999 , at Nasr Dairy Cattle Station. The aim of the research is to evaluate sires geneticelly by using best linear unbiased prediction ( BLUP) according to the stillbirths of their daughters after adjusting for fixed effects and to estimate heritability, phenotypic trend for the mentioned trait. Data were analayzed by using General Linear Model within SAS program to investigate the effectof some fixed factors ( season and year of calving, parity sex of calf ) on the stillbirths. Components of variance for the random effects in the employed mixed model were estimated by the Minimum Variance Quadratic Unbiased Estimation (MIVQUE) method. The Harvey program was also used to estimate BLUP values for sires. The overall mean of stillbirths was 11.19% in primiparous, 8.69% in multiparous and 9.49% in both of them.The effect of all fixed factors was significant (P < 0.01 ) . Heritability of direct effect estimated for stillbirth rates in primiparous and multiparous and in both of them were 0.03 , 0.007 , 0.02 respectively ,whereas corresponding estimates of heritability of maternal effects were 0.04 .0.02 ,0.03 respectively .

26 Cites in Articles

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Funding

No external funding was declared for this work.

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The authors declare no conflict of interest.

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No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

rashad firas. 1970. \u201cThe effect of some factors on stillbirth in primiparous and multiparous Holstein cattle in Iraq\u201d. Unknown Journal GJMR Volume 12 (GJMR Volume 12 Issue 3): .

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A total of 9691 records of calves belonged to 3076 Holstein cows and 58 sires were analyzed from 1995 to 1999 , at Nasr Dairy Cattle Station. The aim of the research is to evaluate sires geneticelly by using best linear unbiased prediction ( BLUP) according to the stillbirths of their daughters after adjusting for fixed effects and to estimate heritability, phenotypic trend for the mentioned trait. Data were analayzed by using General Linear Model within SAS program to investigate the effectof some fixed factors ( season and year of calving, parity sex of calf ) on the stillbirths. Components of variance for the random effects in the employed mixed model were estimated by the Minimum Variance Quadratic Unbiased Estimation (MIVQUE) method. The Harvey program was also used to estimate BLUP values for sires. The overall mean of stillbirths was 11.19% in primiparous, 8.69% in multiparous and 9.49% in both of them.The effect of all fixed factors was significant (P < 0.01 ) . Heritability of direct effect estimated for stillbirth rates in primiparous and multiparous and in both of them were 0.03 , 0.007 , 0.02 respectively ,whereas corresponding estimates of heritability of maternal effects were 0.04 .0.02 ,0.03 respectively .

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The effect of some factors on stillbirth in primiparous and multiparous Holstein cattle in Iraq

Dr. Firas Rashad Al-Samarai
Dr. Firas Rashad Al-Samarai

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