INFLUENCE OF THE AGE ON THE DAY OF FIRST CALVING AND THE LENGTH OF CALVING INTERVALS ON THE MILK YIELD OF COWS
Journal Title: Folia Pomeranae Universitatis Technologiae Stetinensis Agricultura Alimentaria Piscaria et Zootechnica - Year 2016, Vol 37, Issue 325
Abstract
The study involved 264 Holstein-Friesian cows with a performance of more than 10 000 kg of milk that were kept in one of the largest farms in Wielkopolskie voivodeship in Sano Agrar Institute in Lubień. One determined the influence of age at first calving on the performance in the next three 305-day lactations. Analysis of individual traits was performed through analysis of variance considering the effect of lactation and age at first calving and calving interval. One also calculated the coefficient of simple correlation between the measured trait and the age at first calving and calving interval length. The highest yields of milk, fat and protein in the first and second lactation were reached by cows, the age of which, at first calving, was 26.0 months. In the third lactation, the highest milk and protein yield were found in the group of cows calved at earliest i.e., at the age of 23.0 months. The highest protein content of the first, second and third lactation of cows was identified in the milk of cows calved for the first time at the age of 23.0 months. The most favourable calving interval for the tested herd was more than 401 days.<br/><br/>
Authors and Affiliations
Paweł BORTACKI, Ryszard KUJAWIAK, Ewa Czerniawska-Piątkowska, Jerzy WÓJCIK, Wilhelm GRZESIAK
Keywords
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- EP ID EP76951
- DOI 10.21005/AAPZ2016.37.1.01
- Views 154
- Downloads 0
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