Evaluation of Some Economical Traits of Commercial Friesian Cows Herd Raised in Egypt | ||
| Journal of Animal and Poultry Production | ||
| Article 18, Volume 11, Issue 12, December 2020, Pages 623-628 PDF (929.44 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jappmu.2020.161235 | ||
| Authors | ||
| F. H. Farrag; N. A. Shalaby; A. A. Gabr* ; M. A. Lahoul | ||
| Animal Production Department, Faculty of Agriculture, Mansoura University, Al-Mansoura, Egypt | ||
| Abstract | ||
| This study conducted to evaluate some of non-genetic and genetic parameters that affect the productive and reproductive traits. Total of 3596 records of 1021 Holstein Friesian cows in the first five parities were collected during the period from 2002 to 2016 from a commercial farm. The details values of productive traits (total milk yield (TMY, kg), lactation period (LP, day) and dry period (DP, day)), as well as, details values of reproductive traits (days open (DO, day), number of services per conception (NSC), age at first calving (AFC, months) and calving interval (CI, day)) were considered. The effects of season of calving and parity on productive and reproductive traits were also examined. The results revealed that the season of calving and parity had significant effect on all the studied traits. Heritability estimates for TMY, LP, DP, DO, CI, NSC and AFC are 0.110, 0.089, 0.071, 0.100, 0.103, 0.123 and 0.168, respectively. The phenotypic correlations of all studied traits were positive and ranged from 0.016 to 0.989, except that between TMY and all the reproductive traits as well as DP were negative. The values of genetic correlations among all studied productive and reproductive traits were positive and ranged from 0.031 to 0.998, except DP and TMY was negative. The present study is an effective way for using in improving programs for milk yield of Holstein Friesian cows in commercial farms. | ||
| Keywords | ||
| Milk production; reproduction performance; non-genetic factor; Friesian | ||
|
Statistics Article View: 204 PDF Download: 402 |
||
