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The Ethiopian Agricultural Research is one of the oldest and largest agricultural research system in Africa. Ethiopian Agricultural Research System (EARS) has evolved through several stages since its first initiation during the late 1940s, following the establishment of agricultural and technical schools at Ambo and Jimma. In 1955, a full-fledged agricultural experiment station was established at Debre Zeit (now named Debre Zeit Agricultural Research Center) under the then Imperial College of Agricultural and mechanical Arts (now called Haramay [...]

Paper

Written Paper

Reproductive performance and lactation yield of F1 (Bos indicus x bos taurus) animal at Bako  [2000]

Chernet Asfaw; Gebre-Egziabhere Gebreyohanes; Gizaw Kebede; Mulugeta Kebede; et al.

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This paper reviews lactation and reproductive performances of F1 crossbred cows produced at Bako Research Centre by inseminating cows of two indigenous breeds of cattle (Horro and borana) with semen from three exotic breeds) (Friesian, Jersey, and Simmental), Measures of lactation and reproductive performances, differences in these measures among different F1 crossbred cows, possible causes of the differences and their correlations are summarized. Significant variations were observed among the F1 crossbred cows in age (p0.05) and weight (p0.01) at first calving, postpartum anoestrus interval (p0.01), days to conception (P0.01) but not in number of services per conception, and lactation length. Least squares means analysis of the data showed that Borana crosses had significantly (p0.05) longer postpartum anoestrus interval, longer lactation length, and higher lactation milk yield than Horro crosses while Jersey crosses had shorter age at first calving (P0.01), lower wight at first calving (p0.01), shorter postpartum anoestrus interval (P0.01), shorter days to conception (0.05), and shorter calving interval (P0.05) than both Friesian and Simmental crosses. Higher laction milk yield of Borana crosses over Horro crosses was due to longer lactation length of Borana crosses as there was strong correlation (p0.01) between the two traits (0.69). Weight at first calving had significant effect (p0.01) on lactation milk yield, postpartum anoestrus interval, days to c
onception and calving interval while only lactation milk yield was affected significantly (p0.05) by age at first calving. This fact was further evidenced by the strong correlation of weight at first calving (p0.01) to these traits while the correlation of age at first calving to any of the traits was low. the correlation between age and weight at first calving was low indicating that both traits are highly influenced by environmental factors. The correlations among the postpartum reproductive traits were strong and positive but it was low and negative between postpartum reproductive traits were strong and positive but it was low and negative between postpartum anoestrus interval and number of services per conception. Estimates of reproductive and lactation performances reported in this study for the F1 ceossbred cows at Bako were found to be lower than that reported for F1 crossbred cows at Bako were found to be lower than that reported for F1 crossbred cows at different places indicating that these traits were highly influenced by environmental factors than breed differences, thus showing the poor management of the cows in terms of feed and health under Bako condition.

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Bibliographic information

Language:
English
Type:
Summary
In AGRIS since:
2002
Publisher:
ESAP
All titles:
" Reproductive performance and lactation yield of F1 (Bos indicus x bos taurus) animal at Bako "
Other:
" Summary (En) "
" 4 tables; 17 ref. "
" Livestock production and the environment-implications for sustainable livelihoods, Ethiopian Society of Animal Production (ESAP), Addis Abeba (Ethiopia)).- Addis Abeba (Ethiopia): ESAP, 2000. 7. Annual Conference of the Ethiopian Society of Animal Production,7. Annual Conference of the Ethiopian Society of Animal Production,Addis Abeba (Ethiopia),26-27 May 1999. p. 386-396 "