Effect of Dry Period and Supplementation on Subsequent Lactation and Reproductive Performance of Grade Cows in the University Farm

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Date
2015-06-22
Authors
Mustafa El Nour, Gorashi
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Publisher
UOFK
Abstract
To study the effect of dry period and supplementation on subsequent performance, 15 cows similar (P > 0.05) in age, weight, and parity number, were chosen from a dairy herd belonging to the University of Khartoum farm. The cows were divided into three groups of five cows each. GI was used as a control with no dry period and no supplementation, GII was dried at the 7 months of pregnancy and fed on roughage only, GIII was dried at the 7 months of pregnancy and maintained on roughage plus 1kg of the concentrate mixture/cow/day. The results of this study indicated that GIII cows excelled (P<0.05) GI cows in milk yield. Although GII yielded more milk than the control, the difference was not significant. The average daily milk yield expressed as liters/day was 12.36±7.4, 15.98±8.1 and 16.74±8.9 for GI, GII and GIII, respectively. The results also showed that milk fat% was significantly (P<0.01) higher in the control group when compared with both GII and GIII. Moreover, the milk fat content of GIII was significantly (P<0.01) higher than that of GII cows. The SNF of GIII milk excelled (P<0.05) both GI and GII. The other milk constituents were not affected by the treatment. The birth weight of calves born to GIII were significantly (P<0.05) higher than that of those of the other two groups. The average calf birth weights in kg were 28±0, 28±8 and 33.6±12 for GI, GII and GIII, respectively. The calves daily weight gain was significantly (P<0.01) higher in GIII when compared to GI and GII. Moreover, the daily weight gain of GII was, significantly higher (P<0.01) when compared to the control group. The weaning weights of calves were 47.3, 51.5 and 63.75 for GI, GII and GIII, respectively. The data indicated that the period from calving to recurring post-partum oestrus and the period between two consecutive oestrus cycles were not affected by the treatment. The treatments had a highly significant effect on non-return-rate (N.R.R). GIII and GII showed 75% N.R.R compared to 25% for GI. The service period was affected by the treatment. Number of inseminations/conception were significantly (P<0.05) affected by the treatment. They were 2±2, 1.6±1 and 1.5±2 for GI, GII and GIII, respectively.
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Keywords
Dry Period,Supplementation,Subsequent Lactation, Reproductive Performance, Grade Cows,University Farm
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