Analysis of factors influencing fertility and lamb survival of Latvian dark head sheep | Latvijas tumsgalves aitu auglibu un jeru saglabasanu ietekmejoso faktoru analize
2006
Barzdina, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Kairisa, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine
The research has been carried out on peasants' farm Mezaleji in Platone village of Jelgava region. The farm is situated 17 km from Jelgava and it specializes in rising of Latvian dark-head sheep breed. The average age of the sheep mothers of the flock was 3.6 years and the average fertility 156%. The age of the sheep mothers in the flock had an essential influence on the fertility of sheep mothers (p is less than 0.001) and lamb survival till weaning. Sheep mothers born in twins were 0.9 months younger however it did not influence the fertility and lamb survival essentially. Meet type brood-rams used on the farm, especially Il-de-France breeds, reduced daughters' fertility. Fertility and lamb survival to Latvian dark-head and German dark-head ram daughters were similar. There has been observed a weak negative correlation between the fertility of sheep mothers and lamb survival (r = - 0.17).
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