Lauksaimniecības dzīvnieku gēnu bankā uzkrātā Latvijas tumšgalves aitu biomateriāla izcelsmes un produktivitātes vērtējums
2019
Barzdina, D., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Animal Sciences | Kairisa, D., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Animal Sciences | Klavina, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Scientific Lab. of Biotechnology | Balins, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Scientific Lab. of Biotechnology
After joining the European Union, conservation programs for livestock genetic resources were developed and approved in Latvia. 6 animal breeds that were established in Latvia were recognized as endangered, and one of them was Latvian Dark-Headed Sheep (LT). The aim of the study was to evaluate the origin of the accumulated biomaterial of LT breed sheep and breeding rams and their respective productivity ratios. Breeding rams, whose bioproduct was accumulated in the Biotechnology Scientific Laboratory, were culled from flocks at an average age of 6.3 years. The analysed rams were used for breeding of 6,827 sheep, from which 5,232 had been lambing. The average number of lambs from one ewe was 1.6, and average body weight of lambs was 4.0 kg, corrected live weight after 70 days of age − 22.8 kg, the average live weight gain of lambs was 235.9 g. The sheep from which the bioproduct had been stored were kept in flocks for an average of 8.4 years, with an average lambing count of 6.6 times, and average fertility 167.3%. The offsprings of the analysed ewes were born with an average weight of 3.8 kg, their adjusted weight at the age of 70 days was 24.5 kg, and average daily weight gain was 295.2 g.
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