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Comparison of reproductive status in relative and non-relative Shall ewe lambs | ||
| علوم و فنون دامپروری | ||
| Article 4, Volume 7, Issue 27, September 2018, Pages 33-40 PDF (985.43 K) | ||
| DOI: 10.22092/aasrj.2018.116762.1133 | ||
| Authors | ||
| Hoda Javaheri Barfourooshi* 1; Hassan Sadeghipanah2; nader asadzadeh1; Nader Papy1; Hosein Piri3 | ||
| 1Assistant professor of Animal Science Research Institute of Iran | ||
| 2Animal Science Research Institute | ||
| 3Tarvij Deputy of Extension, Agricultural Research | ||
| Abstract | ||
| The aim of this study was to determine the effect of using nonrelative rams and controlled mating on reproductive status of Shall ewe lambs. One hundred and fifty ewes were randomly divided into control and experimental groups. In the control group, ewes with the rams of the same herd and in the experimental group, ewes with four rams with appropriate phenotype from other herds were pregnant. At lambing, the number, gender, and birth weight of lambs were recorded. The first generation ewe lambs were divided equally into two relative and non-relative according to their birth time and birth type. Information on reproductive traits including pregnancy rate, multiplicity, birth weight, number of births, breeding rate, the survival rate from birth to weaning and weaning weight during first and second lambing and production of milk after second lambing was recorded. Information about reproductive traits was recorded during their first and second lambing. Statistical analysis was performed using parametric and nonparametric methods. Reproductive traits (pregnancy rate, multiplicity, weight of births and male birth rate) were not significantly different in lambs of the two groups, except for multiplicity in the first lambing for non-relative ewe lambs (14.1) was higher than relative ewe lambs (0.82) and for weaning weight that was higher for lambs of relative group (28.45 kg) than non-relative group (26.03 Kg) (P <0.05). The results of this study showed that the use of non-relative rams has a positive effect on the multiplicity, which can improve the economic efficiency of the flock. | ||
| Keywords | ||
| Shall sheep; Relationship; Growth performance; Puberty; Reproductive performance | ||
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