Effect of Genotype on Growth and Basic Carcass Characteristics in Male Lambs

Abstract

The aim of the study was to evaluate the eff ect of a genotype on growth and basic carcass characteristics in male lambs. The experiment was carried out at an organic farm in Proseč and four diff erent genotypes were included in the experiment: Šumavská sheep (S) 100, n = 8; S 50 Texel (T) 50, n = 11; T 75 S 25, n = 13 and S 75 T 25, n = 11. The genotype had no signifi cant eff ect on most of the monitored growth parameters. The highest daily gain (DG) in the interval from birth to 100 days of age was found out in S 75 T 25 (327 g) but the highest DG from birth until the end of the experiment was found in S 50 T 50 (199 g). By contrast, the lowest DGs in both above mentioned intervals were found out in S 100 (265 and 147 g, respectively). With regards to basic carcass characteristics, the genotype had a signifi cant eff ect only on proportion of kidney. The highest carcass yield (44.80%) was found in S 50 T 50 and the lowest (37.66%) in S 100. The best conformation score was found in S 75 T 25 (3.18) and the lowest fatness score in S 50 T 50. To conclude, it is possible to state that use of the Texel rams in crossing with the Šumavská ewes had a positive eff ect on both growth and basic carcass characteristics.

Evaluation of Growth Intensity in Suffolk and Charollais Sheep

“…Thanks to this higher growth intensity in the first month of life, the lambs of the SF breed reached sliggailhtly higher weight results in 30 and 100 days of age (SF = 36.51 ± 5.80; Ch = 35.58 ± 7.102 kg). A significantly lower weight of the lambs of the breed Ch in 100 days of age was described by Koutná et al (2016). Nevertheless, in the evaluation of mean daily gain (Tab.…”

“…Effects of gender, litter size and age of ewes on growth of lambs were studied by Ploumi et al (1997), Analla et al (1998), Kuchtík and Dobeš (2006). Effect of the breed of parents in relation to growth ability in lambs was studied by Navrogenis (1996), Suarez et al (2000), Burke et al (2003), Kremer et al (2004), Simeonov et al (2014) and Koutná et al (2016). Growth can be evaluated not only by weight gains, but also on the basis of dimensions of individual body parts.…”

Growth Curves in Lambs of Various Genotypes Created on the Basis of Improved Valachian and Tsigai Breeds

“…Fitting growth curves to growth functions is an effective method for assessing different management factors, or for breeding purposes. Growth intensity of lambs before weaning and after weaning significantly affects the economics of farming (Petr et al, 2009;Pajor et al, 2008;2009a;Wolfová et al, 2009;Komprda et al, 2012;Svitáková et al, 2014;Koutná et al, 2016). The growth is affected by many factors where the most important are the breed, nutrition, sex, litter size, management, biotic stress, health and age of mothers (Kuchtík and Horák, 2007;Dobeš et al, 2007;Hošek et al, 2008;Pajor et al, 2007;2009b;Kuchtík et al, 2010;Zapletal et al, 2010;Štolc et al, 2011;Ptáček et al, 2013;Lupi et al, 2015;Waheed et al, 2015;Aguirre Riofrio et al, 2016;Mellado et al, 2016;Moreira et al, 2016;Sieklicki et al, 2016).…”