The effects of nutrition,age at first calving and breed on some reproductive traits in butana dairy farm

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Date
2003
Authors
Hiba Mohamed Ismail
Journal Title
Journal ISSN
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Publisher
University of Khartoum
Abstract
The aim of this investigation was to study the effects of foreign blood percentage, age at first calving and plane of nutrition on some reproductive traits which involved calving interval and days open (service period) in two dairy herds, composed of imported Holstein- Friesian and cross-breed with 50% foreign blood. The reproductive traits under study were then compared between the two herds. The results indicated that the age at first calving has no significant effect (P<0.05) on calving interval and days open, despite that the length of calving interval was longer in the pure Holstein- Friesian cows (465.2) days compared to the cross-breed with 50%foreign blood (403.9) days. The results showed that the foreign blood percentage had a significant effect (P<0.05) on calving interval and days open of both imported herd and crossbreed. Also the results showed that the plane of nutrition has a significant effect (P<0.05) on calving interval and days open, in the two herds. Three types of ration were used with different levels of protein, energy and minerals. The first ration contained 10.63MJ/kg energy, 15.22% protein and 1.42%minerals and the second one was composed of 10.76MJ/kg energy, 19.59 % protein and 1.3% minerals, the third ration contained 11.61MJ/kg energy, 17.62 protein and 2% minerals. From the results, the first ration resulted in the longest calving interval (488.8) days and days open (208.8) days. ٤ The calving interval and days open for the second ration were 436.5,156.5days for the animals maintained on the second ration, where as the third ration resulted in the shortest calving interval (411.14) days and the shortest days open (131.14) days. When the three rations were compared, it can be concluded that ration (C) had resulted in the shortest calving interval and shortest days open.
Description
Thesis submitted to the university of khartoum in partial fulfillment of the requirement for the degree of Ms.c. dairy production and technology
Keywords
University of Khartoum first calving reproductive traits butana dairy farm
Citation
Hiba Mohamed Ismail, The effects of nutrition,age at first calving and breed on some reproductive traits in butana dairy farm .- Khartoum : University of Khartoum, 2003 .- 62p. : illus., 28cm., MS.c.