Variations saisonnières de la qualité du sperme chez le bélier Ile-de-France. II. Fécondance : relation avec les critères qualitatifs observés in vitro

Colas, G.; Guérin, Y.

doi:10.1051/rnd:19810306

Cited by 27 publications

(13 citation statements)

References 5 publications

(9 reference statements)

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“…We found in our experiment, above the culling threshold, a permanent and positive relationship between motility and fertility. This small effect contrasts with the absence of effect previously found by Colas (1981) in Ile de France and by Duval et al (1995) in one Lacaune centre even if this centre displayed a lower effect in our study. But this agrees with the important role of this characteristic on the transport and survival of spermatozoa in the female reproductive tract and fertility (Salamon and Maxwell, 2000).…”

Section: Discussioncontrasting

confidence: 56%

Environmental and genetic variation factors of artificial insemination success in French dairy sheep

David

Robert-Granié

Manfredi

et al. 2008

Animal

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Artificial inseminations (n 5 678 168) recorded during 5 years in five French artificial insemination (AI) centres (2 'Lacaune', 1 'Manech tê te rousse', 1 'Manech tê te noire' and 1 'Basco bé arnaise') were analysed to determine environmental and genetic factors affecting the insemination results. Analyses within centre-breed were performed using a linear model, which jointly estimates male and female fertility. This model combined four categories of data: the environmental effects related to the female, those related to the male, the non-sex-specific effects and finally the pedigree data of these males and females. After selection, the environmental female effects considered were age, synchronisation (0/1) on the previous year, total number of synchronisations during the female reproductive life, time interval between previous lambing and insemination, already dry or still lactating (0/1) when inseminated, and milk quantity produced during the previous year expressed as quartiles intra herd * year. The environmental male effects were motility and concentration of the semen. The non-sex-specific effects were the inseminator, the interaction herd * year nested within the inseminator, considered as random effects and the interaction year * season considered as a fixed effect. The main variation factors of AI success were relative to non-sex-specific effects and to female effects. Heritability estimates varied from 0.001 to 0.005 for male fertility and from 0.040 to 0.078 for female fertility. Repeatability estimates varied from 0.007 to 0.015 for male fertility and from 0.104 to 0.136 for female fertility. These parameters indicate that genetic improvement of AI results through a classical polygenic selection would be difficult. Moreover, in spite of the large quantity of variation factors fitted by the joint model, a very large residual variance remained unexplained.

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Section: Discussioncontrasting

confidence: 56%

Environmental and genetic variation factors of artificial insemination success in French dairy sheep

David

Robert-Granié

Manfredi

et al. 2008

Animal

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“…In the V breed, no significant variations appeared at any time of the experiment, except in the last month when BW decreased (P < 0.05). However, Thibault, 1956 ;Ortavant, 1958 ;Pelletier, 1971 ;Albério, 1976 ;Colas, 1980Colas, , 1981 (Colyer, 1971 ;Courot, 1971 ;Albério, 1976) En plus du pourcentage total d'anomalies morphologiques, nous avons calculé la proportion de spermatozoïdes porteurs de malformations de la tête (lésions de l'acrosome, micro-ou macro-céphalies, têtes pyriformes ou allongées etc...), connues pour leur effet sur la fécondance (Colas, 19811 et (Ortavant et Thibault, 1956 ;Ortavant, 1958, Pelletier, 1971Albério, 1976 ;Schanbacher, 1979 ;Schanbacher et Ford, 1979 ;Lincoln, 1979 ;Colas et al, 1985) (Fowler, 1965 ;Neves, Günzel et Schmidt, 1980 ;Colas, 1980 ;Mickelsen, Paisley et Dahmen, 1981 ;Amir et al, 1986).…”

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Variations saisonnières du diamètre testiculaire et de la morphologie des spermatozoïdes chez le bélier Vendéen et chez le bélier Texel

Colas¹,

Guérin²,

Lemaire³

et al. 1986

Reprod. Nutr. Dévelop.

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“…breed or genetic group (Ologun et al, 1981;Chenoweth, 1983). Colas and Guerin (1981) found an association between spermatozoa anomalies with fertility tests in Ile-deFrance rams. However, Galina et al (2007) demonstrated that libido is neither related to semen quality nor to scrotal circumference, so that it is possible to obtain an excellent semen sample in bulls with low libido.…”

Section: Introductionmentioning

confidence: 99%

Study of correlation between reaction time and refractory period (as indices of libido) with semen characteristics in ArkharMerino×Moghani and Baluchi×Moghani rams

Moghaddam

Pourseif

Rahimi

2012

Italian Journal of Animal Science

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This study was conducted on 10 crossbred rams consisted of 5 ArkharMerino×Moghani (AM×MG) and 5 Baluchi×Moghani (BL×MG), to analyze correlation between semen characteristics and libido activity. The semen samples were evaluated for semen volume, total sperm per ejaculate (TSE), spermatozoa concentration (SC), color, wave motion, spermatozoa progressive motility, percentage of live and abnormal spermatozoa, pH, rate of metabolic activity of spermatozoa and semen index. The libido of rams was measured by two indices including reaction time (RT) and refractory period (RP). While RT only had a negative and significant correlation with semen volume (r=-0.15, P=0.04), but RP had a significant correlation with seminal traits except for TSE. Moreover, libido test scores between two genetic groups did not have a significant difference (P<0.05). Considering the observed significant correlation between RP and semen characteristics, we suggest that a reliable monitoring with the aim of detecting rams of poor semen quality and libido seems worth making an effort for the future of the herd. In summary, the reported correlation between libido and seminal traits will confirm the importance of simultaneous selection for both libido and semen quality in the herd. Finally, the importance of performing an individual evaluation of semen and libido for each male and for using a ram in breeding programs is highlighted, due to the existence of differences among rams as well as a low correlation between semen characteristics and libido indices.

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Variations saisonnières de la qualité du sperme chez le bélier Ile-de-France. II. Fécondance : relation avec les critères qualitatifs observés in vitro

Cited by 27 publications

References 5 publications

Environmental and genetic variation factors of artificial insemination success in French dairy sheep

Environmental and genetic variation factors of artificial insemination success in French dairy sheep

Variations saisonnières du diamètre testiculaire et de la morphologie des spermatozoïdes chez le bélier Vendéen et chez le bélier Texel

Study of correlation between reaction time and refractory period (as indices of libido) with semen characteristics in ArkharMerino×Moghani and Baluchi×Moghani rams

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