Effets de l’amprolin-300 Ws sur quelques paramètres de croissance et de reproduction chez le lapin mâle (Oryctolagus cuniculus)

Objectif : L’objectif de la présente étude a été de rechercher les effets de l’Amprolin-300, un anticoccidien largement utilisé en médecine vétérinaire, sur quelques paramètres de croissance et de reproduction chez le lapin mâle de race locale. Méthodologie et résultats : Vingt-quatre (24) lapins âgés de 5 mois environ et pesant entre 2,01 et 2,78 kg ont été répartis en 4 lots comparables de 6 lapins chacun. Ils ont été traités pendant 60 jours avec différentes doses d’Amprolin-300 ws via l’eau de boisson : 0 ; 30 ; 60 et 110 mg/kg de poids corporel. Les résultats obtenus ont révélé que la consommation d’eau a significativement (p<0,05) diminué chez les lapins traités aux doses 60 et 110 mg/kg de poids corporel par rapport aux témoins. Le gain de poids et le gain moyen quotidien ont diminué de manière significative (p<0,05) chez les animaux traités aux doses 30 et 60 mg/kg de poids corporel par rapport aux animaux du lot témoin. Par contre, l’indice de consommation a diminué de façon significative (p<0,05) chez les animaux témoins et chez ceux qui ont ingéré la plus forte dose d’Amprolin-300 ws (110 mg/kg de poids corporel) comparé aux lapins traités avec les doses 30 et 60 mg/kg respectivement. Le pH de la semence a significativement (p<0,05) augmenté chez les mâles traités aux doses 30 et 60 mg/kg de poids corporel par rapport Aux mâles du lot témoin. La motilité individuelle et la concentration des spermatozoïdes ont diminué de manière significative (p<0,05) chez les lapins qui ont ingéré la plus forte dose d’anticoccidien par rapport aux lapins témoins. Conclusion et application des résultats : Ainsi, à la dose de 110 mg/kg de poids corporel, l’Amprolin-300 ws a réduit la consommation alimentaire, le gain de poids, le gain moyen quotidien, le poids spécifique et le pH de la semence. Cette dose a également inhibé la spermatogenèse et réduit le pourcentage de spermatozoïdes mobiles. Son usage devrait donc être règlementé.Mots clés : Amprolin-300 ws, lapin mâle, production et fertilité.Objective: In this study, the effects of Amprolin-300 ws, an anticoccidiostat abundantly used in veterinary medicine, on some growth and reproductive parameters in male rabbits were investigated. Methodology and results: Twenty four (24) rabbits aged 5 months and weighing between 2.01 and 2.78 kg were divided into 4 comparable groups of six rabbits each and treated for 60 days with different doses of Amprolin-300 ws from drinking water: 0, 30, 60 and 110 g/kg of body weight. The results showed that water consumption was significantly (p<0.05) decreased in rabbits treated with 60 and 110 mg/kg of body weight of Amprolin-300 compared to control rabbits. Body weight gain and average daily gain decreased significantly (p<0.05) in animals treated with 30 and 60 mg/kg of body weight compared to control rabbits. On the other hand, feed efficiency decreased significantly (p<0.05) in control animals and those who ingested the highest dose (110 mg/kg of body weight) compared to rabbits treated with 30 and 60 mg/kg of body weight respectively. The pH of semen increased significantly (p<0.05) in animals treated with 30 and 60 mg/kg of body weight compared to control animals. Individual motility and sperm concentration decreased significantly (p<0.05) in rabbits who received the highest dose of Amprolin-300 compared to control rabbits. Conclusion and application of results: Thus, at the dose of 110 mg/kg body weight, Amprolinws-300 reduced in male rabbit, food consumption, body and average daily weight gain, specific weight and pH of semen. It inhibited spermatogenesis and reduced sperm mobility. Therefore its use should be regulated

Phenological Characteristics of the Barred Chicken in Western Cameroon

Between May and June 2011, the growth performance and phenological characteristics of local barred chicken of the Western Highland Cameroon was carried out in the Teaching and Research Farm of the University of Dschang. The data on body weight, body measurements and carcass characteristics were collected on 120 chickens. Matrices correlation and regression curves of body weight on body measurements were established. The results revealed high variability in morphological and biometric characters of barred chicken. At 20 weeks, the average body weight was 1204.09 and 1566.87 g respectively for female and male. The values of the different measurements were significantly (P < 0.05) higher in males as compared to the females. Otherwise, the correlation coefficients of body weight on body measurements were positive in females (0.52 to 0.67). In males, they were positive and weak (0.28 to 0.50) as compared to the females. The characters that can be used to predict weight in males were thoraxic perimeter, tarsus and body length but with a rather low accuracy. Appart from the carcass yield, weight of gizzard, abdominal fat and breast muscle which were comparables between males and females, all other parameters studied including carcass characteristics and various visceral organs were significantly (P < 0.05) higher in males as compared to the females.Keywords: Growth performance, Phenological characteristics, Local barred chicke

Phenological Characteristics of Local Barred Chicken in Western Cameroon

Between May and June 2011, the growth performance and phenological characteristics of local barred chicken of the Western Highland Cameroon was carried out in the Teaching and Research Farm of the University of Dschang. The data on body weight, body measurements and carcass characteristics were collected on 120 chickens. Matrices correlation and regression curves of body weight on body measurements were established. The results revealed high variability in morphological and biometric characters of barred chicken. At 20 weeks, the average body weight was 1204.09 and 1566.87 g respectively for female and male. The values of the different measurements were significantly (P < 0.05) higher in males as compared to the females. Otherwise, the correlation coefficients of body weight on body measurements were positive in females (0.52 to 0.67). In males, they were positive and weak (0.28 to 0.50) as compared to the females. The characters that can be used to predict weight in males were thoraxic perimeter, tarsus and body length but with a rather low accuracy. Appart from the carcass yield, weight of gizzard, abdominal fat and breast muscle which were comparables between males and females, all other parameters studied including carcass characteristics and various visceral organs were significantly (P < 0.05) higher in males as compared to the females.Keywords: Growth performance, Phenological characteristics, Local barred chicke

Effects of heat stress on some reproductive parameters of male cavie (Cavia porcellus) and mitigation strategies using guava (Psidium guajava) leaves essential oil

Climate changes, particularly the increase of temperature are among the main causes behind the decline of fertility in humans as well as animals. In this study, the effects of heat stress on some reproductive parameters of male cavies and mitigation strategies using guava leaves essential oil (GLEO) were studied. For this purpose, 40 male cavies aged 2.5\u20133 months and weighing between 348 and 446 g were divided into 4 groups of 10 animals each and subjected to the following temperatures: Ambient temperature (20\u201325 \ub0C) for the control group, 35 \ub0C for group 1, 45 \ub0C for group 2 and 45 \ub0C+100 \ub5l GLEO/kg body weight, administered by gavage to animals for group 3. Exposure time of heat was 7 h per day for 60 days. Results reveal that the relative weights of testes, epididymis, vas deferens and seminal vesicles were hardly affected by the temperature levels considered (P>0.05). The mass and individual sperm motility was significantly lower (P<0.05) in cavies exposed to the temperature of 35 and 45 \ub0C as compared with those which received GLEO and controls. The percentages of abnormal sperm and altered sperm DNA were higher in animals exposed to temperature of 35 and 45 \ub0C as compared with the controls. The activity of superoxide dismutase significantly increased (P<0.05) in animals exposed to temperature of 45 \ub0C and in those of 45 \ub0C and orally treated with GLEO, compared with cavies exposed to temperature of 45 \ub0C without receiving GLEO. The level of malondialdehyde was significantly increased (P<0.05) in animals exposed to temperature of 35 and 45 \ub0C, whereas the level of nitric oxide was significantly lower (P<0.05) in exposed animals as compared with controls. It was concluded that the exposure of male cavies at 35 and 45 \ub0C for 60 days induce heat stress that causes deterioration of sperm characteristics. These effects that can be mitigated by the administration of guava leaves essential oil