Ріст кролиць материнської форми кросу Hyla NG, отриманих від різних самців, у постембріональний період онтогенезу

Abstract

Goal. To study the growth dynamics of rabbits of the maternal form of the Hyla NG cross obtained from males of the progenitor form with different weight indices. Methods. The live weight and body measurements of the animals were studied by the weight and linear method. The intensity and growth parameters were determined of rabbits of the maternal form of the cross, obtained from the males of the maternal line of the maternal form of the cross Hyla GPC with different weight indices and female rabbits of the maternal line of the maternal form of the cross Hyla GPD. Three groups of female rabbits were studied, which were formed taking into account the value of the weight index of the father: group I — not more than 100 units, group II — between 100 and 120 units, group III — not less than 120 units. Results. At the age of 5 weeks, the live weight of the rabbits of the experimental groups did not differ. At the age of 9 weeks, rabbits born from males with a low body weight index had the highest live weight: it was 72.5 g more (p≤0.05) than that of group II rabbits, and 77.8 g more than that of young animals in group III. At 13 weeks of age, the live weight of group I rabbits was 136.9 g (p≤0.05) higher than the weight of their peers from group II and 68.8 g more than the weight of rabbits from group III. At 17 weeks of age, the trend persisted: Group I rabbits had the highest live weight, but peers born to males with a high body weight index narrowed the difference in live weight. At the age of 19 weeks, group III rabbits had the highest live weight and surpassed group I rabbits by 86 g, and group II rabbits by 162.4 g (p≤0.05). The absolute increase in live weight in the age periods from 5 to 9 and from 9 to 13 weeks was the greatest in rabbits of group I, while in the periods from 13 to 17 and from 17 to 19 weeks the absolute increase was greater in rabbits of group III. Average daily gains in live weight in the early period of growth were the largest in female rabbits of group I, and in the period after reaching sexual maturity, before the first insemination, female rabbits of group III exceeded other rabbits in terms of average daily gains. Conclusions. Based on the results of research, certain patterns of growth of female rabbits obtained from males with different weight indices have been established. Thus, female rabbits whose parents had a high body mass index in the early period of ontogenesis were characterized by less intensive growth, while after reaching puberty their growth accelerated, and at the time of the first insemination they had the largest live weight among their peers.