Feed conversion efficiency in different groups of dairy cows

Abstract

<p>It was estimated the conversion of feed into milk, content of urea, fat, protein, somatic cells in the milk of cows of different breeds in different seasons and months of the year. It was established that the peculiarities of the organization of feeding process significantly influence the productive indicators. Thus, in the conditions of a modern milk complex for 1500 cows with an unattached system of keeping in boxes and feeding with the use of mixed rations, the average value of feed conversion (the measures of digestibility of the feed when it "converted" into dairy products) is 1.38 kg of milk per kilogram of dry matter of<br />feed, and the ratio of fat to protein is 1.10, which is lower than the existing standards. It was established that changes in the conditions by months of the year significantly influenced practically all analyzed qualitative characteristics of milk. And this fact entails the corresponding monthly fluctuations of indicators of safety of products, emissions of by-products of metabolism, and, consequently, fluctuations of dairy cattle breeding impact on the environment and ecology. It was found that milk yield positively and significantly (P≥0.999) correlated with the consumption of feed dry matter (r = 0.454) and feed conversion rate (r<br />= 0.547). At the same time, the milk yield is negatively related to the fat content (r = –0.211) and the protein content (r = –0.192) in milk. The level of urea in milk positively correlates with the content of protein in milk (r = 0.130; P≥0.99). The influence of the factor "breed" on the following important economic-useful traits such as daily milk yield (η2 = 0.131) and feed conversion rate (η2 = 0.130) are proved.</p>

Machine and manual working actions for different manure removing technologies

“…Each of the technologies of cattle housing provides different efficiency of the use of fixed assets, different costs of feed, working time, energy resources. Different technologies (including when various technologies take place in different seasons of the year) provide different quantities and quality of products (RUBAN et al, 2018).…”

Comparative assessment of feed preparation technologies for Ukrainian breeds of dairy cows

“…The basis of this biotechnical system is animals, the breed and breeding value of which depends on the potential of dairy productivity, reproductive capacity and other characteristics, as well as the efficiency of the technological processes of the entire farms (Shortall et al, 2018;P. Dillon et al, 2003;Ruban et al, 2018).…”