GENETIC PARAMETERS FOR SOME REPRODUCTIVE TRAITS IN EGYPTIAN BUFFALOES | ||
| Egyptian Journal of Animal Production | ||
| Article 2, Volume 58, Issue 2, July 2021, Pages 57-61 PDF (640.4 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejap.2021.67104.1011 | ||
| Authors | ||
| A. A.H. Helmy1; Rasha Abdelhamed SOMIDA* 2 | ||
| 1Animal Production Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt | ||
| 2Animal Production Department, Faculty of Agriculture, Fayoum University, 63514 Fayoum, Egypt. | ||
| Abstract | ||
| The traits of the study were age at first calving (AFC), gestation length (GL), days open (DO), and calving interval (CI) records were collated at the database of the Animal Production Research Institute, Agriculture research center, Ministry of Agriculture and Land Reclamation, Egypt.From three buffalo experimental herds; El-Nattafe El-Gadid, El-Nattafe El-Kadim and Gimeza. A total of 19,445 records on 1534 buffalo cows calved from 1991 to 2018 were analyzed. In general, repeatability values were higher than heritability values. A moderate estimate of repeatability was obtained for GL and CI of 0.38 and 0.15, respectively. While the repeatability value was slightly lower at 0.13 for DO. This can be explained by the high obtained values of random permanent effect variance of 73, 955, 1119 for GL, DO and CI, respectively, For all studied traits heritability estimates (h2) were very low as ranged from 0.0001 to 0.01, this could be due to the small estimated additive effect of 2.0, 0.01and 11.0 for GL, DO and CI, respectively. Except for AFC, h2 was slightly higher at 0.13. Estimated genetic (rg) and phenotypic (rp) correlation among all traits were in the same trend being positive and varied from low to high (0.04 to 0.99). The highest correlation value either genetic or phenotypic was between CI and DO. While the lowest rg and rp values were between GL and DO. | ||
| Keywords | ||
| Egyptian buffalo; reproduction traits; heritability; repeatability; correlation | ||
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