SEMEN CHARACTERISTICS, REPRODUCTIVE TRACT DEVELOPMENT, FEED EFFICIENCY AND SOME BLOOD PARAMETERS OF BALADI BULLS AND THEIR CROSSBREEDS WITH ABONDANCE AND TARENTAISE | ||||
| Journal of Animal and Poultry Production | ||||
| Article 3, Volume 7, Issue 1, January 2016, Page 23-32 PDF (448.42 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2016.48262 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. Y. Mohamed; A. M. Abd El-Hafeez; A. A. S. Mahgoub; S. M. Zahed | ||||
| Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Egypt. | ||||
| Abstract | ||||
| Twenty four Bovine males representing three genotypes: Pure local "Baladi" (B), 1/4 Baladi 3/4 Abondance (BA×A) and 1/4 Baladi 3/4 Tarentaise (BT×T). Eight males in each genotype were subjected to evaluate their semen characteristics, reproductive tract development, growth rate, feed efficiency, some blood parameters, thermo-regulatory parameters and body dimensions at puberty and sexual maturity. BT×T bulls showed the best feed efficiency compared with those of BA×A and B bulls. Serum total protein, albumin, globulin, glucose, cholesterol, T3 and testosterone in BT×T had the highest values, followed by BA×A, while B bulls had the lowest ones, either at puberty or sexual maturity. Total weight gain and daily weight gain were significantly higher in BT×T compared to BA×A and B bulls. Thermo-regulatory parameters and body dimensions were affected by the different genotypes. Crossbreeds bulls (BT×T and BA×A) reached age of puberty, sexual maturity and slaughter weight (60 days post sexual maturity) earlier than Baladi bulls. Semen characteristics among the three genotypes were highly significant (P<0.0001) especially of BT×T followed by BA×A compared to B bulls. Testes parameters of BT×T bulls had the highest values for all studied parameters, followed by BA×A, while those of B were the lowest. Sperm production per gram of testicular tissue was also significantly higher in BT×T bulls than the other two genotypes. This study indicated that the superiority of crossbreed bulls especially; BT×T in growth, reproductive performance and feed efficiency compared with pure Baladi bulls. | ||||
| Keywords | ||||
| genotypes; Semen; reproductive tract; feed efficiency; puberty and maturity | ||||
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