Affiliation:
1. Federal state budget scientific institution «Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine»
Abstract
The aim of the work is to study the productivity of Large White gilts that were estimated and selected for herd replacement in the process of line formation. Within 6 generations of selection the age of live weight 100 kg achievement reduces on 6 days, fat thickness on 1,7–2,0 mm, the depth of longissimus muscle increases on 4,9 mm and lean meat output in carcass on 1.4%. The size of litter of dams in selection group increases up to 13,0 piglets, the number of pigs at weaning — to 11,4, the litter weight at 30 days — to 92,4 kg. The productivity increase of replacement pigs is caused by though not high but reliable hereditability indices, calculated according to results of dispersion analysis of data's of 968 gilts, selected from 3 sires groups and 6 dams groups of adjacent generations F2–F3, F3–F4, F4–F5. The influence of sires (factor A) is maximum for age at 100 kg weight (h2=36,5%) and for lean meat output (h2=3,3%) in dams group F3–F4; the fat thickness over 6–7 pectoral ribs (h2=4,8%) and the depth of longissimus muscle (h2=5,4%) in dams group F2–F3. The influence of dams (factor B) is low in all groups. The mutual influence of both factors apparent in dams group F3–F4 in fat thickness in three points of scanning (h2=3,8-7,9 %) and in longissimus muscle depth (h2=2,6%); in dams group F4–F5 — in 100 kg weight age (h2=6,7%) and in fat thickness over the 6–7 pectoral ribs (h2=7,0%).
Publisher
Russian Research Institute of Farm Animal Genetics and Breeding
Reference8 articles.
1. Lopes D. M. et al. Estimation of Fat Depth and Longissimus Muscle Area in Swine by the Use of Real Time Ultrasonography / D. M. Lopes et al.// J. Anim. Sci. – 1987. – Vol. 65 (Suppl. 1). – P. 512.
2. Forrest J. C. et al. A Review of Potential New Methods of On Line Pork Carcass Evaluation / J. C. Forrest et al. // J. Anim. Sci. – 1989. – Vol. 67. – P. 2164.
3. Moeller S. J. et al. Development of Adjustment Factors for Backfat and Loin Muscle Area from Serial Real-Time Ultrasonic Measurement on Purebred Lines of Swine / S. J. Moeller et al. // J. Anim. Sci. – 1998. – Vol. 76. – P. 2008.
4. Sokolov N. V. The method of breeding swine selection of meat type breeds / N. V. Sokolov, N. G. Zelkova, S. N. Zelkov // Patent on the invention № 2680545. – 2019.
5. Merkuryieva E. K. Biometrics in selection and genetics of agricultural animals / E. K. Merkuryieva. M. Kolos. 1970. 424 p.