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Modified Contemporary Comparison of First And Second Lactations In A Herd with Crossbred Bunaji X Friesian Cows

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Author(s): Ogundu | Uduak E., | U. Herbert | M. U. Iloeje

Journal: Journal of Animal and Veterinary Advances
ISSN 1680-5593

Volume: 3;
Issue: 10;
Start page: 670;
Date: 2004;
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ABSTRACT
Using records of a total of 472 daughters, comprising 237 and 235 daughters with 25% and 50% Friesian inheritance respectively, 18 widely used bulls were evaluated by modified contemporary comparison (MCC) for first and second lactations. The daughters were classified into three age classes 24-28 months, 29 - 33 months and 34-38 months. The mean predicted differences for first and second lactation yield (PDLY1 and PDLY2) for the age class 24-28months was 2.8 (0.19) (PDLY1) and 3.8 (4.73) (PDLY2) for 25% and 50% Friesian inheritance respectively. The results obtained show that daughters of the 24-28 months age range had higher mean values for lactation yield when compared with their contemporaries suggesting that they could possibly transmit this superior milking ability. The linear response in PDLY2 to rate of change in PDLY1 in 25% (50%) Friesian inheritance indicated a significant (P
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