Abstract

L.V. Karlova, O.V. Lesnovska*, I.V. Deberina and O.G. Gavrilina

We analyzed the influence of the constitution type of cows of Ukrainian black-and-white milk breed on their milk production and reproductive ability.  Broad-type cows probably dominated over age equivalent of narrow-bodied type by chest-broad and loin-broad indexes by 2.75 (11.2%; P>0.001) and 1.35 (5.04%; P>0.01). The model deviation for broad-bodied and narrow-bodied cows was +8.77 and -6.32, respectively. According to the main linear measurements of the first-born of a broad-leaved type of constitution, We revealed that broad-bodied cattle dominated of their narrow-bodied age mates by the height at withers (by 0.9%), chest depth – by 7.6%, chest width – by 8.5%, loid width – by 8.7%, body length by 10.1%, girth by 3.2%, and the cannon bone circumference by 1.6%. The difference in ratio between relative decline of growth and annual of cattle with different constitutional types was revealed. The broad-bodied yearlings had higher (84.1 ± 1.89) than narrow-bodied (81.2 ± 1.43) ones. Broad-bodied yearlings exceed (P>0.05) the narrow-bodied by the milk yield and fat content - by 9.8 and 10.1% respectively. The productivity factor which is higher by 0.01 (0.9%) indicates that with increase in productivity the broad-bodied cattle had no reduction in reproductive capacity. We registered a high level of differences in the reproductive capacity between the cattle of different body types; however, the difference in living weight was insignificant and was within the range of 1.0%. The first grade cattle increase the fat contamination with milk yield growth, second-grade cattle decrease the milk fat along with yield growth, and third-grade cattle increase has a stable fat contamination. The first-grade cows considered the most valuable. Their rate among the broad-bodied is 11.8%, and 11.1 among the narrow-bodied which promotes the selection of desirable body-type cattle with high productivity and fatty values. Thus, it is obvious to select the cattle with desired constitutional type, which would combine high productive and reproductive qualities.

Share this article