Abstract
The researches have had as the main object the studying of the productive capacity of the sheep populations F1 obtained by crossing the local sheep Tsigai with the Blackhead Teleorman rams brought from southern Romania. The principal objectives of this research were the following: studying the evolution dynamics of weight and the corporal development starting from birth until the age used to mount, ability to secrete milk evaluation, assessment of quantity and quality of wool. The researches have been made in a private exploitation from the North-East part of Romania, and the conducted study emphasize that if the birth body weight of the lots were analyzed at birth there were close to the live weight at 28 days determined by the weight differences that are favourable for the halfbreeds lots and are significant for the statistical thresholds that are considered. At age of 16 months, when females were used to mount the first time, the absolute difference between the live weight of half-breeds and Tsigai breed was over 3 kg and was significantly distinct statistically speaking from the limit of p< 0.01. The production of milk control has been made during the first lactation following that in the next period to continue this research. The first lactation had a total duration of 225 days, and the total production of milk obtained from half-breed females was higher by 13.68% compared to the performance achieved by the sheep of the pure breed Tsigai, justifying this in terms of expanding the type of matting. The researches have continued also with the evaluation of wool production, and the obtained values show that are not significant differences for the total amount of wool obtained from the first cut of. Instead, when there were evaluated some characteristics of which the wool quality depends (length, degree of flexuosity, fine, return to washing) was found that at the Tsigai breed these had higher values, a consequence of the genetic consolidation degree and of the good selection level for this race.
Highlights
Most studies made in Romania (Ionescu et al, 1985; Mochnacs et al, 1978) and in other countries (Borys et al, 2011; Dawson et al, 2006; Hammond, 1961) shows that in order to achieve good results in the increase in sheep and those breeding, special attention is given tangible development
Since Tsigai breed is one in transition, based on studies concluded that the best option is to use Blackhead Teleorman rams
The results obtained are original because they were obtained on the base of studying for the first time in Romania of half-breed resulting from the crossing of Tsigai sheep with Blackhead Teleorman rammers
Summary
Most studies made in Romania (Ionescu et al, 1985; Mochnacs et al, 1978) and in other countries (Borys et al, 2011; Dawson et al, 2006; Hammond, 1961) shows that in order to achieve good results in the increase in sheep and those breeding, special attention is given tangible development. From this point of view, to improve some poor ownership such as height, body weight, the precocious and others in the unit have been carried out research to appeal to the importation of breeding rams. To characterise well the biological value of these, we consider many aspects in which we wanted to emphasize the defining elements
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