Zhodnocení růstu a základních ukazatelů jatečné hodnoty jehňat plemene romney marsh.

This dissertation deals with evaluation of lamb growth ability and lamb carcass value of Romney Marsh sheep breed. Monitoring and evaluation of lambs were conducted with 18 lambs on the family organic farm of Ing. Paul Šeliga in Vrbětice in the years 2014 to 2017. In the first charter, there are listed information about the importance and general characteristics of sheep breeding in the Czech republic. Then there are also included a development, trends and perspectives of sheep breeding in the Czech Republic. In the next section, it is described the issue of growth and carcass quality of lambs. The following is a characteristic of a farm in Vrbětice in district Zlin and characteristic of Romney Marsh sheep breed. In scope of this evaluation of lamb growth live weight at birth, in 100 days of age and before slaughter was observed. In term of monitoring there was traced influence of lamb sex on growth ability indicators, more precisely on live lamb weight and lambs´ daily weight gain. Effect of gender had inconclusive impact on most of monitored live weight. With regards to the daily weight gain, there was inconclusive effect of the above mentioned indicators on all daily weight gains. There was evaluated influence of lamb sex on carcass value during the monitoring all slaughter lambs. There has also been evaluated the slaughter yield, fattiness and flesh ratio of individual body parts. Results of check slaughter show that sex factor had inconclusive impact on most carcass value´s monitored indicators. Highly provable sex effect was recorded only on live weight before slaughter. Conclusive impact was recorded on slaughter ready body weight, kidney weight, weight of lamb kindey fat, weight of shoulders, kidney ratio, kidney fat ratio and shoulder ratio. On the other hand sex factor did not have evidential influence on slaughter age, slaughter yield, subjective grading, getting meatiness, fattiness, weight and proportion of skin, back and legs. From the point of view of the quality of the right leg, there was a very evident effect of sex on the proportion of fat from the leg, the apparent influence on the weight of the bones from the leg and the inconclusive influence on the weight of the leg, the weight of fat from the leg, the proportion of the meat from the leg and the proportion of the bones from the leg