| Přispěvatelé: |
Šiukščius , Artūras, Juozaitienė , Vida, Gružauskas , Romas, Šimkus , Almantas, Januškevičius , Algirdas, Kauzonienė , Ilona, Šimkienė , Aldona, Pečiulaitienė , Nijolė, Japertienė , Renata, Lithuanian University of Health Sciences, Šimkienė, Aldona |
| Popis: |
The objective of the thesis : to analyse crossbred lamb growth speed, the amount and quality of production gained and to compare this data with the productivity of thoroughbred R lambs. Tasks of the thesis: 1. To analyse growth speed of thoroughbred Romanov and RxBD crossbred lambs. 2. To compare data of thoroughbred Romanov and RxBD crossbred lamb butchery data. 3. To analyse physical and chemical qualities of thoroughbred Romanov and RxBD crossbred lamb meat. 4. To analyse composition of ewe milk. 5. To analyse the physical and technical properties of thoroughbred Romanov and RxBD crossbred lamb wool. In the period 2011- in the farm of A. Krivelis the productivity and production quality of Romanov and Romanov x Berišon Dusher crossbreed lambs was analysed. It has been found that the weight of crossbred lambs is greater. The average weight of born crossbred lambs amounted to 3.47 kg or 2.09 kg or was 151 %. (P>0.05) greater than the average weight of thoroughbred lambs. The weight of lambs on the 21st day after birth is an important indicator since according to it the milk productivity of the ewe can be determined. During this period both Romanov lambs and crossbred lambs gained a similar amount of weight: accordingly 3.78 kg and 3.68 kg, however, as the weight of newborn lambs had differed significantly, the difference on the 21st day after birth amounted to 39 % (P0.05) more than in the meat of thoroughbred Romanov lambs. According to physical and chemical properties the technological and nutritional value of meat was determined, it was found that crossbred lamb meat had a higher pH, the difference amounted to 0.25 (P>0.05). Crossbreed lamb meat was of lighter colour, meat colour indicator a* (redness) and b* (yellowness) were also higher for crossbreed lamb meet. Higher water adhesiveness (2.63 %. P0.05) were calculated for crossbreed lamb meet as well. Conclusion: 1. The weight of newborn RxBD weight of crossbred lambs was 2.09 kg or amounted to 151 % (P>0.05) greater weight than R lambs. 2. During 5-8 month period Romanov and Berishon Dusher crossbred lambs gained on average 5.68 kg, or 36.41 % more weight (P0.05) more intramuscular fat than in the meat of Romanov lambs. 8. Higher water adhesiveness (2.63 % P0.05) were calculated for crossbred lamb meet. |
