Recherche d'une prévision précoce de l'amplitude des variations saisonnières du diamètre testiculaire et du pourcentage de spermatozoïdes anormaux chez le bélier Ile-de-France. 1. Animaux nés en février

Colas, G.; Lefebvre, J; Guérin, Jean-Pierre

doi:10.1051/rnd:19880405

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Measurement of the scrotal circumference (SC) is highly correlated with testicular weight in dairy and beef bulls [11] and constitutes an essential part of the breeding soundness evaluation [9]. Colas et al, [12] and [13] and Folch [5] state that in the young animals this measure is useful to make an early preliminary selection based on more or less gonad development, because the testicular size of the young lamb and the same animal at the adult age are highly correlated, so this measurement can utilized to sort out the best producers of semen from the age of 8 months. The same approach can be seen in our sheep farms.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Scrotal Measurements and Weight of Ouled Djellal Rams in Eastern and South-Eastern Algeria

et al. 2014

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The aim of this study was to evaluate some performances in Ouled Djellal (OD) rams. (21) rams divided equally into three age groups, I: 2-3 years, II: 4 years, III: 5-6 years, and were followed at farm in East Algeria, and 07 lambs, at the Artificial Insemination Centre (South-Eastern). We have determined monthly: antero-posterior diameter of testis, scrotal volume and circumference, and body weight (BW). Young rams showed an increase in values of BW and scrotal measurements (SM) with significant differences with p <0.01 and p <0.001 respectively since comparison "spring vs summer" and "spring vs autumn", and highly significant positive correlation between BW and SM but no between left and right testicle. A highly significant correlation is noted in Adult rams between BW and SM for groups I and II, no in group III. An important effect of age on BW and SM is noted with significant variation (from p <0.01 at p <0.001), since comparison groups I vs II, and I vs III but no in groups II vs III. This study showed a positive correlation between SM and BW and the peak of measurements is reached around 4 years of age and far to stabilize relatively thereafter

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Section: Introductionmentioning

confidence: 99%

Factors Affecting Scrotal Measurements and Weight of Ouled Djellal Rams in Eastern and South-Eastern Algeria

et al. 2014

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“…In addition to gathering information on reference values for semen characteristics, evaluation of the effects of PTP on ram semen characteristics at this latitude was another pursuit for this study, along with the evaluation of putative differences on semen traits between the two genetic groups, to identify the most suitable line for breeding purposes. In intensive management systems, a significant number of ewes are inseminated in nonbreeding season (Colas et al, 1988(Colas et al, , 1990.…”

Section: Introductionmentioning

confidence: 99%

Photoperiod as a factor for studying fluctuations of seminal traits during breeding and non-breeding seasons

Pourseif¹,

Moghaddam²

2012

J. Cell Anim. Biol.

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The main purpose of this study was to evaluate the influence of photoperiod on the seminal traits of crossbreed wool-producing rams throughout one year period. For the effect of photoperiod (PTP), two periods were considered: Decreasing daylight length (summer and autumn) and the other, increasing daylight length. For this study, 5 Baluchi × Moghani (BL × MG) and 5 Arkharmerino × Moghani (AM × MG) rams were used. Semen collection started from first of October 2010 to end of September 2011. After a training period of 2 weeks, semen ejaculates were evaluated for volume, total sperm/ejaculate (TSE), concentration (SC), color, wave motion (WM), percentage of progressive motility (PM), percentage of live sperm (LS) and abnormal sperm (SAB), pH, methylene blue reduction time (MBRT) and semen index (SI). Analysis of the year long data showed that semen with the best quality was collected in September to November (P < 0.05). Significant seasonal variations of semen traits were observed for all seminal traits except for PM, LS and MBRT. Yet, no statistical differences were found between the crosses (P > 0.05). Although, there were significant seasonal changes in seminal traits of the crosses, the fresh semen showed adequate quality to be used for artificial or natural insemination throughout the year. PTP was found to influence semen production in two genetic groups at 38°02' N, 46°27' E and an altitude of 1567 m above sea level of Iran. However, these effects were not detrimental to the use of rams for breeding purposes throughout the year.

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Influence of season and age on sexual maturation parameters of Texel, Suffolk and Ile-de-France rams

Mandiki

Derycke

Bister

et al. 1998

Small Ruminant Research

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Recherche d'une prévision précoce de l'amplitude des variations saisonnières du diamètre testiculaire et du pourcentage de spermatozoïdes anormaux chez le bélier Ile-de-France. 1. Animaux nés en février

Abstract: Summary. Early prediction of the magnitude of seasonal variations in testis diameter and percentage of abnormal spermatozoa in the lle-de-France ram.

Cited by 4 publications

References 11 publications

Factors Affecting Scrotal Measurements and Weight of Ouled Djellal Rams in Eastern and South-Eastern Algeria

Factors Affecting Scrotal Measurements and Weight of Ouled Djellal Rams in Eastern and South-Eastern Algeria

Photoperiod as a factor for studying fluctuations of seminal traits during breeding and non-breeding seasons

Influence of season and age on sexual maturation parameters of Texel, Suffolk and Ile-de-France rams

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