Reproductive indices of the HHB backcross were better than those of the HO. The calving interval and the days open of the HHB backcross were significantly shorter than those of the HO. The fertility of the HHB backcross was not methods of reproductive performance improvement for local ethiopian cattle pdf by the level of the THI. The conception and the pregnancy rate of the HO decreased from 35.
In conclusion, despite their high milk production efficiency, pure HO had retarded reproductive performance and adaptability. On the other hand, the HHB backcross had a better adaptability and fertility under Egyptian conditions. Check if you have access through your login credentials or your institution. Borana and Horro breeds were evaluated with the goal of developing appropriate breeding programs. Borana breed was evaluated for beef, milk and for dual purpose while Horro was evaluated for milk and dual purposes. More genetic gains were obtained from bull selection groups than the cow selection groups.
Horro was evaluated for milk and dual purposes. Two units, breeding unit and production unit, consisting of six selection groups were defined for both breeds. Selection criteria used were yearling weight, milk yield, age at first calving, calving interval and calf survival to yearling for dual purpose program and milk yield, age at first calving, calving interval and calf survival to yearling for milk production program. In addition, yearling weight, age at first calving, calving interval and calf survival to yearling were used to improve beef production in Borana breed.
For all goal traits investigated, more genetic gains were obtained from bull selection groups than the cow selection groups. From the estimated annual genetic gains for the individual goal traits, all traits had favorable genetic gains except age at first calving. Genetic gains per year were highest for milk yield followed by live weight. Genetic gains were near zero for the other traits.
Nearly comparable annual genetic gains were estimated for both Borana and Horro cattle breeds assumed for milk improvement program under different selection proportions. Estimated genetic improvements of about 291. The corresponding improvements for Horro were 291. 64 for Borana Vs 78. Estimated genetic improvements for live weight ranged from 38.
11 kg for Borana and 34. 46 kg for Horro when both cattle breeds investigated for dual purpose program. In the current study information is lacking on economic values for each goal trait. Thus, further works are warranted. Except for age at first calving, the genetic gain per year in yearling weight, milk yield, calving interval and survival to yearling obtained from the different options are satisfactory and can result in reasonable genetic improvements of these cattle breeds. Please enable scripts and reload this page. Select a country, economy or region to find embassies, country briefs, economic fact sheets, trade agreements, aid programs, information on sanctions and more.
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