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International Journal of Morphology

versión On-line ISSN 0717-9502

Int. J. Morphol. vol.30 no.4 Temuco dic. 2012

http://dx.doi.org/10.4067/S0717-95022012000400019 

Int. J. Morphol., 30(4):1369-1372, 2012.

 

Scrotal Circumference and Testicular Morphometric Characteristics of the Camel (Camelus Dromedarius) in the Semi-Arid Environment of Northern Nigeria

 

Circunferencia Escrotal y Características Testiculares Morfométricas del Camello (Camelus Dromedarius) en el Ambiente Semiárido del Norte de Nigeria

 

*Ibrahim Ali Abdullahi; *Hassan Al-Hassan Musa & **Aliyu Jibril

* Department of Animal Science, Kano University of Science and Technology, Wudil, Nigeria.

** Department of Animal Science University of Maiduguri, Maiduguri, Nigeria.

Correspondence to:


SUMMARY: Reproductive tract of 12 camels (Camelus dromedarius) were used to evaluate testicular morphometry. The testicular morphometric characteristics measured were scrotal circumference (in situ), paired testis weight, epididymal weight and mean epididymal length, testis volume, and testis density. There were no significant difference (p >0.05) between the left and right organs, but there were numerical differences between all the parameters. A highly significant positive correlations (p <0.05, p <0.01, p <0.001) exist between the scrotal circumference, testicular and epididymal morphometry, except for testis density which is non- significant (p >0.05). It was concluded that testicular morphometry would provide reliable information in predicting sperm production of camels in the semi arid environment.

KEY WORDS: Camels; Scrotal circumference; Testicular morphometry; Epididymis; Semi-arid.


RESUMEN: El tracto reproductivo de 12 camellos (Camelus dromedarius) fue utilizado para evaluar la morfometría testicular. Las características morfométricas testiculares medidas fueron la circunferencia escrotal (in situ), peso testicular pareado, peso epididimario y longitud media del epidídimo, volumen y densidad testicular. No hubo diferencias significativas (p> 0,05) entre los órganos del lado izquierdo y derecho, aunque se observaron diferencias numéricas entre todos los parámetros. Correlaciones positivas altamente significativas (p <0,05, p <0,01, y p <0,001) existen entre la circunferencia escrotal, morfometría testicular y del epidídimo, a excepción de la densidad testicular que no fue significativa (p> 0,05). Se concluyó que la morfometría testicular podría proporcionar información fiable para predecir la producción espermática de camellos en el ambiente semiárido.

PALABRAS CLAVE: Camellos; Circunferencia escrotal; Morfometría testicular; Epidídimo; Semiárido.


 

INTRODUCTION

The potentials of camel as a food producer in the arid and semi- arid areas of the world are well recognised. They have provided man with animal protein and energy and give nomads immense mobility (Knoess, 1979). They are animal genetic resources and constitute indispensable natural resources that must be properly managed (Djemmali & Alhadrami, 1998). Although many studies praised their unique characteristics especially under the most stressful condition, the absence of reliable genetic strategies is a real handicap for camel development. By virtue of these attributes and potentials, the role of camel as food animals is being accepted globally and the camel scientist (Faye & Esenov, 2005) stated that camel has unfathomed potentials for satisfying humans future dietary and medicinal needs.

Camels are known to be seasonal breeders, and their reproductive efficiency under natural pastoral condition is low (Skidmore, 2008). Their fertility characteristics have not been fully documented to facilitate effective genetic improvement. In the male for instance, there is the need to establish measurable criteria for judging breeding soundness and guiding selection of males for breeding.

Morphometric analysis on the testes of any species or breed is necessary in predicting not only sperm production but also of the storage potentials and fertilizing ability of the breeder male. Similarly, Osinowo et al., (1981) and Togun & Egbunike (2006) reported that the testes size is a good indicator of the present and future sperm production in bulls. There is at present a paucity of information in the available literature on the testicular morphometric characteristics and their application in the prediction of good sire in camelids. Testicular measurement and the changes that occurs during growth of the testes from birth to maturity have however been well documented for goats (Bitto & Egbunike, 2006), rams (Setchell, 1978) and bulls (Willis, 2001; Dyce et al., 2002). The aim of the present study is to evaluate the testicular morphometry in camel in the semi-arid environment of northern Nigeria.

MATERIAL AND METHOD

Sample collection. Reproductive tracts of 12 matured camels were obtained in toto after slaughter from the Kano central abattoir. Collections were done between 0500 and 0700 hours on 3 separate days. The reproductive tracts were immediately brought to the laboratory covered in ice and were processed on the same day.

Testicular morphometry. Scrotal Circumference was evaluated using a piece of thread placed at the greatest diameter and measured on a rule as reported by Osinowo et al. (1981). All weighing of samples was done using a highly sensitive balance in the laboratory.

Paired testes weight and epididymal weight. The testes and epididymis was separated free of adhering connective tissues and fats. The left and right testes and epididymis were measured separately and their weight recorded. The epididymis was then divided into caput, corpus and cauda segment.

Testes and Epididymal volume. The volume of the testes and epididymis were measured volumetrically using the Archimedes principles of water displacement in a measuring cylinder and result recorded.

Testes density. The tested density was calculated from the testes and volume and expressed as g cc-1: Testes density = Testes weight (g)/Testes volume (cc).

Tunica albuginae weight. The tunica albuginae was then peeled off each testis after cutting the testes in halves and the weight value recorded.

Statistical analysis. Data collected were subjected to student t -test and the one way analysis of variance (ANOVA) and correlation analysis (Steel & Torry, 1996).

RESULT AND DISCUSSION

The results of the morphometric characteristics of camels and their derivation were summarized in Tables I and II respectively. The mean scrotal circumference, paired testes weight, paired epididymal weight, mean epididymal length, mean testis volume and mean testis density were 23.73 ± 1.34, 147.69 ± 25.39, 33.68 ± 2.42, 27.39 ± 0.79, 68.79 ± 11.55 and 1.10 ± 0.04 respectively, while the epididymal segment were caput (17.08 ± 1.00), corpus (6.90 ± 0.49) and cauda (9.70 ± 0.39). There was a great similarity between the overall means of the paired left and right parameters (Tables I and III) of testicular morphometry, although numerical differences exist.

However, there is no available literature that describes the testicular morphometry of camels, but Osman & el-Azab (1974) reported that the mean testis of camels weigh between 80 and 104 g which is comparable with the result of the present study. More so, Sisson & Crossman (1969) reported that the testes of the camels are much smaller than those of the stallion, bull, ram and boar. Contrary to the earlier report by Osman & el-Azab that corpus epididymis is the largest region in size, the present study reveals that the caput epididymis is the larger than the corpus epididymis. This is similar with the reports of Bitto & Okpale (2006) in bulls and Ugwu (2009) in bucks.

Table IV shows the correlations between the scrotal circumference and the testicular morphometric characteristics. The scrotal circumference had a highly significant positive correlation with testes weight (r = 0.887, p <0.001), epididymal weight (r = 0.743, p <0.01), tunica albuginea (r = 0.758, p <0.01), testes volume (r = 0.817, p <0.001) and epididymal length (r = 0.602, p <0.05), except for the relationship with testes density which was negatively correlated.

Studies by Osinowo et al., (1977), Nwakalor & Obasi (1991), Bitto & Okpale and Ugwu had earlier reported similar relationship between scrotal circumference and testis, epididymal, and tunic weight in other species of animals elsewhere. There were also positive correlations between testicular and epididymal morphometry (r = p <0.05, p <0.01, p <0.001), except for testicular density (r = p >0.05). The non-significant correlation coefficient observed for testis density with almost all morphometric characteristics studied agreed with the report of Togun (1981) and Togun et al., (2006) which asserted that testicular characteristics cannot be predicted from testis density.

The good and positive correlation of scrotal circumference, testis weight, epididymal weight and length and other morphometric characteristics (except for testis density) would be a reliable predictor of sperm producing ability and fertility of camels, since testis weight is known to be highly correlated with sperm reserves in the testis or epididymis, and this is a direct reflections of testicular integrity for sperm production (Osinowo et al., 1977), Ogwuegbu et al., (1985), Adeyemo et al., (2007). Similarly, Okwun et al., (1996) reported that males with larger testis tend to produce more sperm. Therefore, it is concluded from these results that testicular morphometric characteristics could be used to predict the sperm production capacity in live camels, and reliable selection for breeding based on the testicular morphometry is possible.



Fig. 1. Left and right testicular and epididymal morphometry in camels (Camelus Dromedarius).

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Received: 20-12-2012
Accepted: 18-05-2012

 

Correspondence to:

Ibrahim Ali Abdullahi

Department of Animal Science
Kano University of Science and Technology
Wudil, Kano State
NIGERIA

Email: talk2aai@yahoo.com

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