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Relationship between udder dimensions and milk yield of Kenana × Friesian crossbred cows

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Author(s): M. P. Deng, | T. M. Badri, | M. Atta | M. E. Hamad

Journal: Research Opinions in Animal & Veterinary Sciences
ISSN 2221-1896

Volume: 2;
Issue: 1;
Start page: 49;
Date: 2012;
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Keywords: Capacity | Circumference | Length | Measurements | Teats | Udder

ABSTRACT
An investigation was carried out to study the effects of parity order, lactation stage and milking time on dairy cows' udder dimensions (circumference, length, fore and hind depths, fore and hind teats lengths and udder capacity). The relationship of milk yield with these measurements was also aimed. 118 Kenana × Friesian crossbred cows of the farm of the Armed Forces Cooperative Corporation, were grouped according to parity order (1-8 parities) and lactations stage (early, mid and late). The udder measurements were taken before and after morning and noon milking for consecutive 15 days. Three-way analysis of variance was used for the statistical analysis. Correlations and linear regressions of milk yield on the different udder measurements were also examined. The average milk yield was 6.03±2.71 kg/milking, whereas udder measurements before milking averaged 105±15.0 cm, 44.8±7.43 cm, 23.7±3.11 cm, 23.6±3.71 cm, 6.78±1.81 cm and 5.99±1.66 cm, for udder circumference, length, fore depth, hind depth, fore teat length and hind teat length, respectively. The average calculated udder capacity before milking was 1067±265 cm3. The results revealed that all the studied udder measurements increased with parity order. The udder measurements were higher before the morning milking than before the noon milking. Stage of lactation did not affect the udder measurements. The study concluded that these Kenana × Friesian crossbred cows had good shaped udder but relatively long teats. It also concluded that when evaluating the udder measurement factors such as period between milking and cows' age should be put into consideration. It is worth mentioning that the length of the udder before milking is the most udder measurement variable with milk yield (correlation coefficient = 0.64) and each cm change in udder length represent 0.22 kg milk yield change.
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