STUDY OF MORPHOLOGICAL AND MILK PRODUCTION TRAITS OF A ROMANIAN BLACK AND WHITE COW POPULATION FROM THE SOUTH-WESTERN ROMANIA

L.T. Cziszter, S. Acatincăi, A. Bognar, I. Tripon, D. Gavojdian, Siomna Baul, Silvia Erina

Abstract


The aim of the paper was to investigate the influence of the parity on the milk production and morphological traits in the Romanian Black and White cow population. Cows were divided into three groups: first, second, and third and over lactations. Morphological traits were measured in 66 cows out of which 15 primiparous cows, 22 cows at the second lactation and 29 cows at the third or higher lactation. The body measurements were: height at withers, height at back, height at rump, oblique trunk length, chest depth, trunk depth, chest width, hips width, pins width, rump length, body length, heart girth and shinbone circumference. Body weight was determined with a special tape. Four body indices were calculated: lateral body format index, height difference index, chest depth index, and rump shape index. For the milk production, a total number of 925 normal lactations were processed, out of which 323 first lactations, 354 second lactations, and 248 third and over lactations. Differences among the three age groups were tested using analysis of variance. Body sizes of the Romanian Black and White cows were significantly influenced by the parity (p<0.05), increasing as animals grew older. Generally, the highest growth of body regions was observed between the second and third lactations. Body indices were not significantly influenced by the age of cows (p>0.05), except for the rump shape index that was higher in older cows (p<0.05), meaning that the rump width at hips was 5.69% higher than rump length. Milk production per normal lactation was 4056.3 kg milk with 3.873% butterfat and 3.055% protein. This production was 5-6% significantly lower (p<0.05) than milk produced by older cows.

Keywords


morphological traits; milk production; parity; Romanian Black and White; cows

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DOI: http://dx.doi.org/10.15835/buasvmcn-asb:65:1-2:773


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