Effect of some factors on growth of lambs from crossing between the Improved Wallachian and East Friesian

Abstract

ABSTRACT:The effect of some factors (genotype, sex, litter size, age of dam at lambing, month of lambing and year of birth of lamb) on the growth of lambs -crossbreds between the Improved Wallachian (IW) and East Friesian (EF) breed was evaluated in operating conditions during two successive years. Three genotypes were evaluated: IW 50 EF 50, EF 75 IW 25 and EF 87.5 IW 12.5. The evaluation of the effect of genotype on growth showed that this factor did not have a significant effect on the majority of growth traits under study. In the period from birth to 100 days of age the highest daily gain was found in IW 50 EF 50 (263 g). The daily gains of EF 75 IW 25 and EF 87.5 IW 12.5 in this period were lower but identical (244 g). Age of dam had a significant effect on the majority of growth traits under study. Sex of lamb had a significant effect on body weight at 100 days of age and also on the majority of daily gains under study. The factors litter size, month of lambing and year of lamb birth were the most significant sources of variation of daily gains. As far as the non-genetic factors were concerned, the highest daily gains from birth to 100 days of age were recorded in males (259 g), in singles (260 g), in lambs from 4-years-old ewes (269 g), in lambs born in January (263 g) and in lambs born in the first year of evaluation (256 g). The analysis of phenotypic correlations indicated that body weight at birth showed a positive and highly significant (P ≤ 0.01) effect on the majority of growth traits under study. All phenotypic correlations between individual body weights were positive and high (P ≤ 0.01). The majority of phenotypic correlations between individual daily gains under study were also positive and high (P ≤ 0.01).

Growth traits and survival rates of Akkaraman lambs in breeder flocks in Konya Province

“…However, in a previous study, the effect of birth type was not significant on preweaning ADWG (26). This result was different from results of the present study and other previous studies (5)(6)(7)(8)(9). This different result may have stemmed from the genetic, maintenance, feeding, and climatic differences for Norduz sheep.…”

“…It is known that the effects of some factors, such as genotype, birth year, birth type, sex of lamb, dam's age, dam's live weight at mating season, and the maintenance and feeding of ewes, have significant influence on birth weight (BW) and weaning weight (WW) (5)(6)(7)(8)(9).…”

Analysis of multivariate relations among birth weight, survivability traits, growth performance, and some important factors in Suffolk lambs

“…Litter size was the major effect influencing either survivability traits or, in particular, growth performance traits; this is in accordance with previously published studies of Gootwine and Rozov (2006), Kuchtík andDobeš (2006), andMilerski et al (2006). Wolfová et al (2009) Bucek et al (2015).…”

Influence of selected factors on growth performance of Suffolk lambs and their crossbreds

“…Similar results were previously observed by Kuchtík and Dobeš (2006) (2010) also reported higher growth performance in singles compared to lambs from multiple litters. Significant differences in LW100 of twins vs. triplets (1.17 kg; P < 0.05) were observed in our study as well.…”

“…Previous studies confirmed significant differences of growth performance in depending on breed (Milerski et al, 2006;Maxa et al, 2007), ewe's live weight at mating (Abdel-Mageed and El-Maaty, 2012;Aliyari et al, 2012;Vatankhah et al, 2012), litter size (Kuchtík and Dobeš, 2006;Cloete et al, 2007), sex of lambs (Mohammadi et al, 2010, Ptáček et al, 2011.…”