Feed conversion efficiency in different groups of dairy cows

S. Yu. Ruban, A. V. Perekrestova, V. P. Shablia, V. M. Bochkov


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
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
= 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.

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Arndt, C., Powell, J.M., Aguerre, M.J., Crump, P.M., Wattiaux, M.A. (2015). Feed conversion efficiency in dairy cows: Repeatability, variation in digestion and metabolism of energy and nitrogen, and ruminal methanogens. J. Dairy Sci., 98(6), 3938–3950.

Detmann, E., Valente, E.L., Batista, E., Huhtanen, P. (2014). An evaluation of the performance and efficiency of nitrogen utilization in cattle fed tropical grass pastures with supplementation. J. livestock science, 162, 141–153.

Ertl, P., Knaus, W., Zollitsch, W. (2016). An approach to including protein quality when assessing the net contribution of livestock to human food supply. Animal, 10(11), 1883–1889.

Huhtanen, P., Nousiainen, J. I., Rinne, M., Kytölä, K. and Khalili, H. (2008) Utilization and partition of dietary nitrogen in dairy cows fed grass silage-based diets. J. Dairy Sci., 91, 3589-3599.

Hutjens, M.F. (2005). Dairy Efficiency and Dry Matter Intake University of Illinois Proceedings of the 7th Western Dairy Management Conference, March 9-11, Reno, NV, 71-76.

Hutjens, M.F. (2006). Managing milk components. Available from: http://livestocktrail.illinois.edu/uploads/dairynet/papers/Hutjens%20Managing%20Milk%20Components.pdf/ Accessed on 22.12.2017.

Ishler, V. (2002). Nitrogen, Ammonia Emissions and the Dairy Cow. The Pennsylvania State University. Penn State’s College of Agricultural Sciences. Available from: http://mie.esab.upc.es/ms/informacio/residus_ramaders/Ammonnia%20emissions%20dairy%20cow.pdf/ Accessed on 20.12.2017.

Jonker, I.S., Kohn, R.A., Hight, I. (2002). Use of milk Urea Nitrogen to improve Dairy Cow Diets. J. Dairy Sci., 85, 939-946.

Merkur’eva, E.K. (1983). Henetyka s osnovamy byometryy. Moscow. Kolos (in Russian).

National Research Council. (2001). Nutrient Requirements of Dairy Cattle: Seventh Revised Edition, 2001. Washington, DC: The National Academies Press. https://doi.org/10.17226/9825

Reed, K.F., Casper, D.P., France, J, Kebreab, E. (2015). Prediction of nitrogen efficiency in dairy cattle: A review. CAB Reviews: Perspectives in Agriculture, Veterinary Science, Nutrition and Natural Resources. 10, (001). doi: 10.1079/PAVSNNR201510001.

Ruban, S.Yu., Borshch, O.V., Borshch, O.O. et al. (2017). Suchasni tekhnolohiyi vyrobnytstva moloka (osoblyvosti ekspluatatsiyi, tekhnolohichni rishennya, eskizni proekty). Kharrkiv. Stylizdat (in Ukrainian).

Ruban, S.YU., Vasylevskyy, M.V. (2015). Orhanizatsiya normovanoyi hodivli v skotarstvi. Kiyv. (in Ukrainian). Shablia, V.P. (2014). Erhonomichna otsinka protsesiv pryhotuvannya ta rozdavannya kormiv. Visnyk ahrarnoyi nauky, 6, 68-72 (in Ukrainian).

Yonng, A. (2001). Milk Urea Nitrogen Test (MVN). Utah State university extengion. Issued in furtherance of Cooperative Extension work in cooperation with the U.S. Department of Agriculture. Cooperative Extension Service, Utah State University, Logan, Utah.(EP/DF/12-2001). Available from: https://extension.usu.edu/files/publications/publication/AG_Dairy-01.pdf/ Accessed on 22.12.2017.

Zamani, P.R. Miraei-Ashtiani, S., Alipour, D., Aliarabi, H., Saki, A.A. (2015). Genetic parameters of protein efficiency and its relationships with yield traits in lactating dairy cows. J. Livestock Science, 138, 272-277.

DOI: http://dx.doi.org/10.15421/2018_196

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© 2017 Ukrainian Journal of Ecology. ISSN 2520-2138