Exterior parameters of holstein-breeding cows of german breeding

Аннотация

Little variation was observed between the body sizes of the cows in the experiment. For example, the fat height of cows in experimental groups I and II was 3.3 cm or 2.5% (P<0.05) and 7.8 cm or 5.7% (P<0, 05), wither height by 2.5 cm or 1.8% (P< 0.05) and 5.4 cm or by 3.8% (P<0.05), chest width by 1.8 cm or 2, 93% (P<0.01) and 2.2 cm or 4.2% (P<0.05), breast depth 1.2 cm or 1.7% ( P<0.01) and 2.7 cm or by 3.7% (P<0.01), chest circumference by 3.9 cm or 1.9% (P<0.01) and by 5.4 cm or 2.6% (P< 0.05), the oblique length of the body by 0.8 cm or 0.5% (P<0.01) and 2.6 cm or 1.7% (P<0.05), the width of the hind femur by 0.7 cm or 1.9% (P<0.05) and 1.8 cm or 3.4% ( P<0.05) and leg circumference 0.2 cm or 0.9% and 1.6 cm or 6.9%. Keywords body dimensions, hip height, chest width, chest circumference, leg circumference. hind femur, oblique length of the body, elongated body structure, tallness indices. Enter In increasing the milk yield of cows, complete nutrition is important in increasing the production of milk products. Because when such feeding is provided, dairy cows are provided with nutrients, minerals, vitamins and other important elements required for the body, which in turn helps to maintain their health, body strength, it is important in increasing resistance to various factors, improving fertility and increasing milk yield. Such opinions can be seen from the conclusions made by many authors based on the results of their research. Products of well-digested animal husbandry, is considered extremely important in human evolution to meet the demands of humans on the earth for livestock products. Fulfillment of this factor is primarily carried out at the expense of improving the productivity and quality of livestock products, feeding livestock and improving the breed. Purpose of the research is to improve the main economic characteristics and productivity characteristics of Holstein cows imported from abroad in the conditions of the Tashkent region by increasing the amount of the feeding ration by 10-15%. is to learn the secret. Research results and analysis The study of external indicators of dairy cows is considered important in determining their productivity trends and evaluating constitution types. We studied the body size of cows in experimental groups at different feeding levels, the results of which are shown in Table 1 207 Международная научно-практическая конференция «ПЕРСПЕКТИВЫ КРОЛИКОВОДСТВА: ПРОБЛЕМЫ И РЕШЕНИЯ» As can be seen from the data in Table 1, there was a slight difference between the body sizes of the experimental cows. For example, the fat height of cows in experimental groups I and II was 3.3 cm or 2.5% (P<0.05) and 7.8 cm or 5.7% (P< 0.05), wither height by 2.5 cm or 1.8% (P<0.05) and by 5.4 cm or 3.8% (P<0.05), breast width 1.8 cm or 2.93% (P<0.01) and 2.2 cm or 4.2% (P<0.05), breast depth 1.2 cm or 1.7% ( P<0.01) and 2.7 cm or 3.7% (P<0.01), chest circumference 3.9 cm or 1.9% (P<0.01) and 5.4 cm or by 2.6% (P<0.05), oblique body length by 0.8 cm or 0.5% (P<0.01) and by 2.6 cm or 1.7% (P<0.05), femur width by 0.7 cm or 1.9% (P<0.05) and 1.8 cm or 3.4% (P<0.05) and calf circumference by 0, 2 cm or 0.9% higher and 1.6 cm or 6.9% higher. These obtained data indicate that the bodies of cows in experimental groups I and II are well developed. Analysis of the data in Table 2 shows that cows in experimental groups I and II have slightly larger bodies than cows in group III, which is 0.8 and 2.8% of their long-leg index, respectively, compared to cows in group III. got a high score. We can also see from the elongation index that cows in all groups have almost the same level of elongated body. Elongation body composition index of cows in experimental groups I and II had a lower index of 2.3 and 1.7%, respectively, compared to that of the same cows in the control group. The exterior of dairy cows is important in creating productive herds of cows with high milk production. Cows that are proportionate in appearance are usually of the milk type and are prolific. It is important to study the features of the exterior in determining the positive correlation between the exterior of cows and milk yield, and based on the obtained results, it is of great practical importance for breeders to improve the selection of their exterior according to acceptable features. Table 1 Body dimensions of first-born cows in the experiment during the 90-day lactation period, cm Body dimensions Groups Basic Ration +10% Main ration +15% Basic ration Group I Group II Group III 208 X ± S x C v, % X ± S x CV, % X ± S x CV, % Height at withers 136, 3 ±1.7 6 4.87 131, 8 ±1, 76 4.06 128,5±1.2 7 2.82 Height at sactum 18,5 ±1. 41 4.5 5 135, 6 ± 1,5 7 3.95 133,1±1, 41 2.88 Chest width 52,1 ± 0,45 6,7 5 51, 7 ± 0, 5 3 5,7 1 49.9 ± 0,4 2 6.35 Chest depth 71,9 ±0, 49 7.46 7 0, 4 ±0, 5 3 6.0 1 69,21±0, 41 6.9 Chest circumference 208,9 ± 1,87 3.1 3 207,4 ± 1, 62 4.0 5 203,5±1,1 1 4.7 3 The oblique length of 152 3 ± 0.5 9 3.9 6 150,5 ± 0