The purpose of research was to study the association of polymorphic variants of growth hormone gene with development, slaughter traits and carcass composition in crossbred Red Angus × Kalmyk bull-calves. The experiment was carried out at LLC “Agrofirma Aduchi” in Republic of Kalmykia. The object of the study was crossbred Red Angus × Kalmyk (F2) bull-calves. The use of Red Angus sires with a high concentration of G allele in GH gene in the reproduction system of a herd made it possible to obtain second-generation crossbred progeny with a genotype distribution of 0.0625: 0.5: 0.4375, respectively, VV: LV: LL. The frequency of V allele reached 0.3125. The superiority of heterozygous individuals in live weight reached 18.0 kg by the age of 18 months (P>0.05). The maximum carcass weight was established in the group of heterozygous individuals, their superiority was 25.3 kg (P <0.01). The advantage in carcass yield of carriers of the minor allele V was 1.7% (P<0.05). The heterozygous animals were superior in flesh part weight in half-carcass by 11.1 kg (P <0.001). A less pronounced intergroup difference was found in bone weight, which reached 1.2 kg (P> 0.05). The monitoring the genetic structure of the herd taken into account the allelic distribution in growth hormone gene will provide the development of meat productivity potential.
The aim of our research was to study the effect of single-nucleotide polymorphisms in growth hormone gene on variability of weight and linear growth in crossbred Red Angus × Kalmyk heifers (F2). The experimental animals were reared in "Agrofirma Aduchi" Ltd. in Tselinniy region, Republic of Kalmykia. Heifers were divided into groups after genotyping in accordance with the allelic variant of the growth hormone gene: I group completed with GH LV heterozygous animals (n = 11 heads), II grouprepresentatives of the homozygous GH VV gene (n = 9 heads). The inter-group differences in live weight were insignificant (P> 0.05) between the carriers of various genotype variants in growth hormone gene in the weaning age (8 months). The advantage in live weight between experimental animals increased to 23.9 kg (P <0.05) at the final stage of the control rearing (18 months). In this period, heterozygous youngsters (GH LV) differed in a large format of the exterior compared to homozygous contemporaries (GH VV). The significant superiority was established absolutely for all studied measurements. The maximum effect of heredity factor on the variability of live weight was detected at the age of 18 months-24.81% (P <0.05). The calculation of the organized factor impact to the overall variability of linear growth in heifers of different allelic variants for the GH gene showed significance (P <0.05) at 18 months of age. Thus, the detection of single-nucleotide polymorphisms in GH gene can improve the accuracy of the selection in beef herds.
В статье изложены результаты сравнительной оценки кожно-волосяного покрова бычков породы обрак французской селекции и сверстников-симменталов отечественной популяции при их выращивании до 19,5-месячного возраста в условиях Центрального Черноземья. Существенных различий между животными обеих пород по структуре волосяного покрова, диаметру волос, их массе, длине и густоте, а также по массе, выходу и толщине шкур в возрасте 15,5 и 19,5 мес. не выявлено. Эти материалы, наряду с другими, являются подтверждением успешно протекающей акклиматизации животных породы обрак в зоне Центрального Черноземья.
The climatic conditions of the sharply continental climate of the Stavropol Territory influenced the skin of gobies of the Kalmyk, Kazakh white-headed and Hereford breeds. During the year, the skin of animals changed, which contributed to the adaptation of the body to the climatic conditions of the dry zone. These conditions influenced the histology and morphology of the skin of 18-month-old gobies of Kalmyk, Kazakh white-headed and Hereford cattle breeds (6 animals of each breed). The results of the study showed that the greatest thickness of the skin has the Kazakh white-headed bullocks (6544±153 microns). The smallest thickness of skin was in animals of the Hereford breed (5602±140 microns). Kalmyk and Kazakh white-headed bulls had a higher content of fine (downy) hair than Hereford bulls did. The content of sebaceous glands in Kalmyk bulls was 1.5 times higher than that in Hereford bulls and 1.1 times higher than that in the Kazakh white-headed breed. The number of sweat glands in the Hereford breed was 1.4 times higher than that in animals of the Kalmyk breed and 1.3 times higher than that in the Kazakh white-headed. The highest content of type I collagen is detected in the skin of animals of Kalmyk and Kazakh white-headed breeds. The presence of a greater thickness of the dermis in combination with an increased content of sebaceous glands in the skin indicates a higher adaptive capacity of animals of the Kazakh white-headed and Kalmyk breeds of cattle to live in extreme weather conditions and affects the quality of raw materials.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.