Direct genetic and maternal effects for birth and weaning weight of Egyptian friesian calves
Other Title(s)
التأثيرات الوراثية المباشرة و الأمية على وزن الميلاد و الفطام في عجول الفريزيان المصرية
Joint Authors
Abu Saq, Fathi Mustafa
Ahtash, Abd al-Karim Imhammad
Source
مجلة جامعة مصراتة للعلوم الزراعية
Publisher
Misurata University Faculty of Agriculture
Publication Date
2021-12-31
Country of Publication
Libya
No. of Pages
9
Main Subjects
English Abstract
The present study was carried out to estimate genetic parameters associated with direct and maternal genetic effects on birth and weaning weights in Friesian herd and to estimate the prediction of breeding values for both traits, by using bivariate repeatability animal model.
The data used in the study included pedigree and weight records of calves born between 1984 and 2014.
Overall means of birth weights B.Wt and weaning weight W.Wt were 37.66 ± 0.08 and 64.02 ± 0.75kg respectively; the average of suckling period (SP) was 61.62± 3.44 days of age.
The person correlation coefficient between birth weight and weaning weight was 0.312, considering that the duration of suckling introduced as partial variable.
The results showed that the year and season of birth had high significant effect on calf birth weight and weaning weight (P <0.0001) in addition the influence of) of sex of calf and dam parity on calf birth weight was highly significant (P<0.0001).
Direct heritability estimates for birth weight B.Wt and weaning weight W.Wt are 0.33 and 0.12, respectively, while, maternal heritability estimates for the same traits are 0.12 and 0.08, respectively.
Total heritability estimates are 0.24 and 0.07 for B.Wt and W.Wt, respectively.
Repeatability estimates are 0.41 and 0.22 for B.Wt and W.Wt, respectively.
Phenotypic and genetic correlations between the traits are 0.38 and 0.80, respectively.
Values of Estimated breeding values ranged from -5.43 to 7.73 kg for B.Wt and ranged from -2.54 to 2.75 kg for W.Wt.
It concluded that the direct and maternal heritability and direct and maternal correlation coefficients for birth and weaning weights were moderate to low, the additive genetic variation for traits was deemed sufficient to allow effective selection for growth performance
Data Type
Conference Papers
Record ID
BIM-1456971
American Psychological Association (APA)
Abu Saq, Fathi Mustafa& Ahtash, Abd al-Karim Imhammad. 2021-12-31. Direct genetic and maternal effects for birth and weaning weight of Egyptian friesian calves. . Vol. 3, no. 1 (Special issue) (Dec. 2021), pp.57-65.Miṣratah Libya : Misurata University Faculty of Agriculture.
https://search.emarefa.net/detail/BIM-1456971
Modern Language Association (MLA)
Abu Saq, Fathi Mustafa& Ahtash, Abd al-Karim Imhammad. Direct genetic and maternal effects for birth and weaning weight of Egyptian friesian calves. . Miṣratah Libya : Misurata University Faculty of Agriculture. 2021-12-31.
https://search.emarefa.net/detail/BIM-1456971
American Medical Association (AMA)
Abu Saq, Fathi Mustafa& Ahtash, Abd al-Karim Imhammad. Direct genetic and maternal effects for birth and weaning weight of Egyptian friesian calves. .
https://search.emarefa.net/detail/BIM-1456971
