Some Studies On The Performance Of Holstein-Friesian Cattle In Khartoum State

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Date
2015-04-07
Authors
Amer Basheer, Malak
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UOFK
Abstract
The objective of this study was to assess some of the reproductive and productive parameters of pure Holstein Friesian (HF) cattle under Azaheer company Farm conditions in Khartoum State. The data were collected from available records of 203 HF cows all of which had four lactations covering the period from 1992-2005. The data was classified according to the years of calving, seasons of calving, (dry summer: March to June, wet summer: July to October, winter: November to February) and number of parities. Eight reproductive and productive traits were analyzed by ANOVA (steel, 1997) using the computer program Statistical Package for Social Sciences (SPSS version 10.0). The means and standard errors for age at first calving, calving interval, open period, number of services per conception, lactation length, milk yield, daily milk yield and dry period were 32.8 ± 0.4 months, 454.8 ± 8.3 days, 176.0 ± 5.2 days, 3.2 ± 0.1, 312.330 ± 4.939 days, 4014.1 ± 82.5 liters, 12.812 ± 0.238 liters, and 156.1 ± 7.0 days, respectively. The analysis of variance revealed that the calving years had a highly significant (P< 0.001) effect on age at first calving, lactation length, milk yield, daily milk yield and dry period. It also had a significant (P< 0.05) effect on calving interval and open period, while it had no influence on number of services per conception. Parity had a significant (P< 0.05) effect on milk yield, but no effect on calving interval, open period, number of services per conception, lactation length, daily milk yield and dry period. x The effect of season of calving was high significant (P<0.001) on number of services per conception, lactation length and daily milk yield and open period. However, its effect on age at first calving, calving interval, milk yield and dry period was not significant (P>0.05). The calving year × season, interaction had a high significant (P< 0.01) effect on number of services per conception. It also had a significant (P< 0.05) effect on age at first calving. Lactation length had a high significant (P< 0.001) effect on open period and dry period. The calving year × Parity, Interaction had a significant (P<0.05) effect on calving interval.
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