Jēru kontrolnobarošanas rezultāti 2020. gadā | Results of fattening lambs in 2020
2021
Kairisa, D., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Animal Sciences | Barzdina, D., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Animal Sciences | Eglite, H., Latvijas Aitu audzētāju asociācija, BDR, Jeru Parish, Valmiera Municipality (Latvia) | Mikelsone, A., Latvijas Aitu audzētāju asociācija, BDR, Jeru Parish, Valmiera Municipality (Latvia) | Leska, V., Latvijas Aitu audzētāju asociācija, BDR, Jeru Parish, Valmiera Municipality (Latvia)
To obtain the results of selection work of sheep breeds, control fattening of lambs is used which is organized under the same keeping and feeding conditions. The analysis of fattening results of the different breed lambs used the Latvian breed mother breeds: Latvian Dark Head (LT), Germany Merino Local (VMV) and Romanov (R) and 3 father breeds: Charolaise (SA), Dorper (DOR), Ile-deFrance (IF). All lambs were bought from the litter, consisting of not less than 2 lambs, but Romanov's breed lambs was born in a significantly bigger litter, but having the lowest average live weight 2.88 ± 0.227 and 3.03 ± 0.191 kg. During the lactation and control fattening period, the highest growth rate of lambs was obtained for IF breed, on average 279.7 ± 10.45 g per day and 433.2 ± 16.07 g per day. IF and SA breed lambs were sold for meat at an average age of 132 and 137 days with a live weight of 49.3 ± 1.26 kg and 46.8 ± 1.26 kg. Lambs of other breeds were sold at significantly older age, but having significantly lower live weight R (42.8 ± 0.31 kg), however, significantly higher for VMV breed lambs (55.3 ± 0.87 kg). Changes in Longissimus Dorsi muscle depth during 1 kg live weight gain ranged from 0.32 mm IF to 0.62 mm SA, but changes in fat tissue layer depth ranged from 0.04 mm IF and SA to 0.06 mm in lambs of LT, R and DOR breeds. As regards the SA breed, the changes in the depth of the Longissimus Dorsi muscle were significantly larger than for the other lambs of the analysed breeds.
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