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2012, Number 2

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AbanicoVet 2012; 2 (2)

Relation of weight and age at puberty, testicular development and seminal characteristics in rambouillet lambs

Morón-Cedillo FJ, Ochoa-Cordero MA,Trejo-González A, Díaz-Gómez MO

Language: Spanish
References: 16
Page: 10-16
PDF size: 259.26 Kb.


ABSTRACT

In order to determine the correlation between different factors involved with the onset of puberty, 18 Rambouillet weaned lambs with 60 days of age and weighing 24.27± 3.5 kg were used. After detachment of the urethral extension the semen extraction began for quantitative analysis (volume and concentration) and qualitative (morphology and motility) each 14 days until the onset of puberty. Measurements of testicular circumference and diameter began at 3 months and then every 14 days until the onset of puberty, in the same way was done with the weight of the lambs. There was a positive correlation (P‹0.01) between the weight of the lambs and scrotal circumference (r=0.56), scrotal circumference and testicular diameter (r=0.72), between the testicular diameter (P‹0.05) and sperm motility (r=0.51), and the volume of the ejaculate (P‹0.05) and sperm motility (r=0.53). On the other hand, there was a negative correlation (P‹0.01) between the percentages of normal sperm and primary (r=-0.94) and secondary (r=-.60) malformations. The close relationship between some reproductive characteristics with age and weight of lambs at puberty and among themselves, as well as the sale of lambs for stallion between 6-7 months of age requires this type of evidence.


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