Growth and development of F<sub>1</sub> hybrid progenies of Schwitz cows using beef breeds
Аннотация
The live weight of bulls at 9 months of age of groups II, III and IV (crossbreed 1) was 305.6, 304.1 and 307.6 kg, respectively, compared with peers of group I 15.3 kg (5.0%), 13.8 kg (4.5%) and 17.3 kg (5.6%) were higher (P≤0.001). Also, for a 9-month growth period, the average daily gain in group II was 1018.5 g, which amounted to 62.2 g or 6.1% (P≤0.001), 25.9 g or 2.5% (P≤0.01) and 24.4 g or 2.4%. (P≤0.01). According to external parameters, the growth of bulls at 6 months of age is 2.3 cm, (2.3%, Р≤0.05), 1.8 cm (1.8%, (Р≤0.05) and 1.3 cm (1.3%) with a height of 2.7 cm, 1.8 cm and 1.6 cm. Later sizes, on the contrary, were higher in bulls of group IV. For example, the depth of the chest of bulls of groups IV is 4.6 cm, 3.3 cm (Р≤0.001) and 1.1 cm (Р≤0.05) in peers of groups I, II and III, respectively, chest circumference 6.2 cm, 4.8 cm (Р≤0.001) and 0.8 cm (P≤0.05), oblique body length 3.8 cm (P≤0.001), 3.6 cm (P≤0.001) and 0.4 cm, width of the hind leg by 0.6 cm, 0.9 cm and 0.7 cm.