The Effect of Some Reproductive and Productive Traits on Lactation Performance of Butana Cattle at Atbara Reseach Station

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Date
2015-04-01
Authors
Bent Whab Abd El-whab, Amna
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UOFK
Abstract
This study was conducted to assess the effect of calving interval, age at first calving, lactation length and parity number on lactation yield, first 100-day milk yield & first 180-day milk yield on the 2nd and 3rd lactation of Butana cattle of the Sudan at Atbara Research Station covering the Years (1990-2001). The records were analyzed using spss computer programmes. The least square means for lactation milk yield, first 100-day milk yield, first 180- day milk yield, age at first calving, calving interval and lactation length were 1942.49 ± 117.65 kg, 812.52 ± 50.66 kg, 1363.18 ± 78.08 kg, 45.09 ± 3.56 month, 382.38 ± 8.30 days and 268.17 ± 5.56 days respectively. The analysis of variance revealed that the calving interval, age at first calving and lactation length influenced the second lactation milk yield (p<0.05). While calving interval has significant effect (p<0.05) on 2nd lactation first 100-day milk yield and highly significant (p<0.01) effect on 2nd lactation first 180-day milk yield. Age at first calving had no significant effect on 2nd lactation first 100-day milk yield and first 180- day milk yield. Lactation length did not significantly affect the 2nd lactation first 100-day milk yield but affected the 2nd lactation first 180-day milk yield. The statistical analysis showed that the calving interval did not significantly (p>0.05) affect the third lactation milk yield, first 100- day milk yield and first 180-day milk yield. Age at first calving had a significant (p<0.05) effect on 3rd lactation milk yield and first 180- day milk yield but non significant effect on first 100- day milk yield. Regarding, lactation length and lactation number the result showed documented highly significant (p<0.05) effect on first 100- day milk yield and first 180- day milk yield on the 3rd lactation. The linear and quadratic regression on age at first calving and lactation length revealed a significant influence on the lactation yield & first 180- day milk yield in both 2nd and 3rd lactation, but a non significant effect on first 100- day milk yield in 2nd lactation. The lactation length on the other hand exerted a highly significant effect on the first 100-day milk yield in the 3rd lactation. Parity number had a significant effect on total milk yield, first 100- day milk yield and first 180- day milk yield for the 3rd lactation. The overall correlation co- efficient between milk yield, lactation length, first 100- day milk yield , first 180- day milk yield and calving interval were found to be 0.68, 0.63, 0.79, and 0.11 respectively. While the correlation between lactation length, first 100- day milk yield, first 180-day milk yield and calving interval were 0.20, 0.35 and 0.16 respectively
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The Effect of Some Reproductive and Productive Traits on Lactation Performance of Butana Cattle at Atbara Reseach Station
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