CONSUMED 1ST GENERATION DAUGHTERS OF VARIOUS HOLSTEIN LINES FEATURES OF COVERING FEED WITH LIVE WEIGHT

Аннотация

The article presents the results of scientific research on the feed conversion ratio of bodies of various lines of the Danish Holstein breed . Keywords : Danish selection, Holstein breed, lines, feed consumption, live weight, EOB, absolute growth, indicators. Introduction. In assessing the efficiency of using young growing bodies in complex herds organized on the basis of industrial dairy production, the level of their feed coverage with live weight during the growth period is of great importance. According to the conclusions, the development of a full-value optimal type of feeding of cows gives a high efficiency in increasing the volume of product production. When using an effective type of feeding, the genetic potential of cows for productivity is revealed to a high degree, and the level of feed coverage with milk is significantly improved, and the economic efficiency of the industry is improved [1]. The results of the study show that providing cows with full-value feeding from weaning to calving leads to an increase in milk productivity in the next lactation. Research results. As shown in Table 1, the productivity of the experimental bodies was directly related to the feed intake and live weight gain indicators studied during our experiment. Table 1 Feed intake live weight ratios of carcasses from different lines Growth I- experiment II- experiment III- experiment period, Absolute EOB Absolute EOB Absolute EOB months growth, growth, growth, kg kg kg 0-90 67.30 270.58 65.2 267.36 63.47 258.63 180 76.59 406.87 74.07 401.04 72.0 389.94 270 72.07 646.85 69.9 608.15 67.5 586.7 360 67.5 694.1 65.0 659.9 63.27 644.96 120 ACADEMIC RESEARCH IN MODERN SCIENCE International scientific-online conference 450 63.07 763.9 60.37 747.64 57.87 734.5 Total 346.53 2782.3 334.54 2683.45 324.11 2612.72 In the experiment, the bodies of the I-experiment group spent 270.58 kg of EOB from birth to 90 days of age, 4.02 kg of EOB to gain 1 kg of weight, 406.87 EOB to gain 1 kg of weight, an average of 5.31 EOB, at the age of 207 days, 8.71 EOB, at the age of 360 days, 10.3 kg of EOB, at the age of 450 days, 12.11 EOB, and an average of 8.02 EOB were spent during the entire experiment. The peers in the II-experimental group spent 267.36 kg of EOB up to 90 days of age, and on average, 4.10 EOB to gain 1 kg of live weight, up to 180 days of age, and 401.04 kg of EOB to gain 1 kg of live weight, on average, 5.41 kg of EOB, up to 270 days of age, and 608.15 kg of EOB to gain 1 kg of average weight, 8.70 kg of EOB, up to 360 days of age, and 659.9 kg of EOB to gain 1 kg of average live weight, 10.15 kg of EOB. Up to 450 days of age, and 746.64 EOB to gain 1 kg of live weight, 12.38 kg of EOB. During the entire period of separation, a total of 2683.45 kg of feed was consumed, with an average of 8.02 kg of feed consumed to gain 1 kg of live weight. The peers in the III-experiment group were given the same dose at the age of 90 days. 258.63 kg of EOB were used to gain 1 kg of live weight, an average of 4.07 kg of EOB were used, at 180 days of age 389.94 kg of EOB were used to gain 1 kg of live weight, an average of 5.41 kg of EOB were used, at 270 days of age 586.7 kg of EOB were used to gain 1 kg of live weight, an average of 8.69 kg of EOB were used. At 360 days of age 644.96 kg of EOB were used to gain 1 kg of live weight, an average of 10.91 kg of EOB were used, at 450 days of age 734.5 EOB were used to gain 1 kg of live weight, an average of 12.69 kg of EOB were used, for the total growth and development periods 2612.72 kg of EOB were used to gain 1 kg of live weight, an average of 8.08 kg of EOB were used . Conclusion: The high absolute growth rates achieved in the period of gestation are explained by the fact that the daughters of Holstein cows of Danish selection reproduce the genetic potential of their mothers during all periods of growth and development and that they assimilate the given nutrients well. List of used literature: 1. Amirov Sh.K., Abulsaidov B.S., Usmonova L.Sh. Feed and nutrition are important factors in the productivity of cows . //Samarkand State University of Veterinary Medicine, Animal Husbandry and Biotechnologies Republican Scientific and Practical Conference on “Prospective Tasks of the Development 121 ACADEMIC RESEARCH IN MODERN SCIENCE International scientific-online conference and Introduction of Innovative Technologies in Agriculture” (May 12-14, 2022, pp. 238-240) 2. Asraev U.B., Kakhkharov A.K., Khidirov K.I. Growth and development of Holstein cattle calves intended for replenishment of the herd during intensive feeding. // Animal husbandry and breeding work. 2019. No. 3. 7- 9 p. 3. Ashirov M., Nurmatov A., Allashov B., Eshmatov I., Ruziev R. Jumadullaev B., Khidirov K., Komilov A., Jamolov S., Bahriddinov F.// Practical guide to the development of livestock farming in farmers' and peasant farms and households Tashkent 2019, 11 p. 4. Batanov S.D., Votoropina M.V., Shkarupa E.I. Produktivnoe dolgoletie i