Effect of some non-genetic factors on growth of lambs of the Charollais breed

Kuchtik, Jan and Dobes, Igor and Tőzsér, János (2007) Effect of some non-genetic factors on growth of lambs of the Charollais breed. ÁLLATTENYÉSZTÉS ÉS TAKARMÁNYOZÁS, 56 (2). pp. 125-133. ISSN 0230-1814

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Abstract

The evaluation of effect of somé non-genetic factors (sex, litter size, age of dam at lambing, month of lambing and year of birth of lamb) on growth of lambs of the Charollais breed was carried out in operation conditions on the University School Farm in Zabcice within an interval of six subsequent years. In all years under study feeding ration of lambs was based on intake of mother milk (ad libitum). Their feeding ration before grazing period further consisted of meadow hay (ad Műm), mineral líck (ad libitum) and concentrate supplement ŐOT (concentrate supplement fór early weaning of calves). The average daily consumption of ŐOT per lamb was,0.10 kg During the grazing period the feeding ration of lambs was as follows: mother’s milk (ad libitum) grazing on alfalfagrass stand (ad libitum), concentrate supplement ŐOT (0.12 kg/head/day), meadow hay (ad hb,tum) and mineral lick (ad libitum). The evaluation of the effects of the factors of sex litter size, age of dam and year ot birth of lamb showed thai all these factors had a -ignificant effect on the majority of growth traits under study. On the other hand, the factor month of lambing had non - significant effect on all body weights and on majority of daily gains under study. From the point of view of the individual non-genetic factors the highest daily gains from birth to 100 days of age were recordedm males (291 q) in singles (289 g), in lambs of three-years-old dams (279 g), in lambs born in March (277 g) and in iambs born within the last year of evaluation (284 g). The phenotyp.c correlat.ons between birth weight and the others body weights showed a tendency to increase with the increasing age All phenotypic correlations between particular body weights were positive and high (P<0.01). The majority of phenotypic correlations between particular daily gains were also positive and high (P<0.01). Growth ability of Charollais lambs was relatively high within the whole period under study and the highest daily ga,„s were recorded in all factors within the period from birth to 30 days of age.

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