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Osteometric Effects of Surgical Caponisation on Some Long Bones in Cockerel Chickens

DOI: 10.1155/2014/645071

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The study was conducted to assess the osteometric effects of surgical caponisation on long bones of cockerel chickens. Sixty- (60-) day-old chicks were distributed into two experimental groups with thirty (30) cockerels per group. The birds were caponised at eight (8) weeks of age. The mean of final body weights of caponized groups was significantly higher ( ) than the uncaponised group. The weights of all long bones measured as well as lengths between the two groups were not statistically different ( ) from one another except the weight of femur of the caponized group and the lengths of tibia and tarsometatarsus ( ) that differed significantly from one another ( ). All the proximal, midshaft, and distal diameters of all the long bones measured between the two groups were not statistically different ( ) from one another except the midshaft diameter of ulna that was significantly higher ( ) in caponized group. It was concluded that caponisation of cockerel chickens at eight (8) weeks of age has no significant osteometric effects ( ) on almost all the long bones studied when they were normalised to the final body weights. 1. Introduction Surgical caponisation is defined as a process whereby the testes are artificially removed via a surgical operation on 6- to 12-week-old chickens [1]. It results in androgen deficiency and thus secondary male sexual characteristics such as the comb, the wattle, fighting behavior, and vocalisation degeneration [2]. It is well known that the abdominal fat pad is significantly increased in capons, regardless of the breed and the age of caponisation or slaughter [3, 4]. There are conflicting reports on the effects of caponisation on the growth of chickens. Several studies have demonstrated that caponisation enhanced chicken growth [5–7] and has no effects on growth [2, 8, 9] or even negative results [10]. Androgen has long been recognized as playing an important role in bone development, physiology, and metabolism [11, 12]; increased growth rate is often achieved after caponisation and likely as a result of androgen deficiency [2]. In humans, Manolagas et al. [13] reported that depressed androgen through exposure to chemicals, testectomy operation, or age has adverse effects on bone growth and development. In poultry, however, very few experiments conducted on the effects of caponisation on the bones of chickens have shown consistent results. For example, Hutt [14] found increased bone length on the caponised white leghorn while Chen et al. [1] and Landauer [15] found no significant effects of caponisation on bone length of

References

[1]  K. L. Chen, T. Y. Hsieh, and P. W. Chiou, “Caponization effects on growth performance and lipid metabolism in Taiwan country chicken cockerels,” Asian-Australasian Journal of Animal Sciences, vol. 19, no. 3, pp. 438–443, 2006.
[2]  K. L. Chen, W. T. Chi, and P. W. S. Chiou, “Caponization and testosterone implantation effects on blood lipid and lipoprotein profile in male chickens,” Poultry Science, vol. 84, no. 4, pp. 547–552, 2005.
[3]  J. A. Cason, D. L. Fletcher, and W. H. Burke, “Research note: effects of caponization on broiler growth,” Poultry Science, vol. 67, no. 6, pp. 979–981, 1988.
[4]  M. Tor, J. Estany, D. Villalba, E. Molina, and D. Cubiló, “Comparison of carcass composition by parts and tissues between cocks and capons,” Animal Research, vol. 51, no. 5, pp. 421–431, 2002.
[5]  M. G. Mast, H. C. Jordan, and J. H. Macneil, “The effect of partial and complete caponization on growth rate, yield and selected physical and sensory attributes of cockerels,” Poultry Science, vol. 60, no. 8, pp. 1827–1833, 1981.
[6]  T. Y. Hsieh, Effects of castration in Taiwan country chicken cockerels on growth performance and lipid metabolism [M.S. thesis], National Chung-Hsing University, Taichung, Taiwan, 2003.
[7]  M. A. Mahmud, P. Shaba, J. Gana, H. Y. Yisa, and R. Ndagimba, “Effects of surgical caponisation on growth, carcass and some haematological parameters in cockerel chickens,” Sokoto Journal of Veterinary Sciences, vol. 11, no. 2, pp. 57–62, 2013.
[8]  M. J. Fennell and C. G. Scanes, “Inhibition of growth in chickens by testosterone, 5 alpha-dihydrotestosterone, and 19-nortestosterone,” Poultry Science, vol. 71, no. 2, pp. 357–366, 1992.
[9]  H. T. Wang, Effects of surgical caponization and administration of Estradiol to chicken embryos on daily activity, agonistic behaviour, growth performance, carcass traits and sensory evaluation of males Taiwan country chickens [M.S. thesis], Department of Animal Science, National Chung-Hsing University, Taichung, Taiwan, 2001.
[10]  T. W. Kuo, Effect of different caponized ways and different caponized weeks on meat characteristics of Taiwan country chicken [M.S. thesis], Department of Animal Science, National Chung-Hsing University, Taichung, Taiwan, 2002.
[11]  M. J. Oursler, M. Kassem, B. L. Riggs, and T. C. Spelsberg, “Regulation of bone cell function by gonadal steroid,” in Osteoporosis, R. Marcus, D. Feldman, and J. Kelsey, Eds., pp. 237–260, Academic Press, New York, NY, USA, 1996.
[12]  L. Pederson, M. Kremer, J. Judd et al., “Androgens regulate bone resorption activity of isolated osteoclasts in vitro,” Proceedings of the National Academy of Sciences of the United States of America, vol. 96, no. 2, pp. 505–510, 1999.
[13]  S. C. Manolagas, S. Kousteni, and R. L. Jilka, “Sex steroids and bone,” Recent Progress in Hormone Research, vol. 57, pp. 385–409, 2002.
[14]  F. B. Hutt, “Sex dimorphism and variability in the appendicular skeleton of the leghorn fowl,” Poultry Science, vol. 8, no. 4, pp. 202–218, 1929.
[15]  W. Landauer, “Studies on the creeper fowl, X1 castration and length of the appendicular skeleton of in normal and creeper fowl,” The Anatomical Record, vol. 69, no. 2, pp. 247–253, 1937.
[16]  S. Leeson, J. D. Summers, and J. P. Walker, “The effect of light and diet on performance and carcass quality of capons,” Poultry Science, vol. 55, no. 1, pp. 438–440, 1976.
[17]  Y. Ono, H. Iwamoto, H. Takahara, and M. Okamoto, “Studies on the growth skeletal muscle of capon. 1. Effects of castration on the weights of skeletal muscle, abdominal fat, intramuscular fat, skin, bone and viscera,” Science Bulletin of Faculty of Agriculture, Kyushu University, vol. 34, pp. 39–46, 1979.
[18]  A. L. Johnson and V. T. Rendano, “Effects of castration, with and without testosterone replacement, on leg bone integrity in the domestic fowl,” American Journal of Veterinary Research, vol. 45, no. 2, pp. 319–325, 1984.
[19]  N. C. Rath, W. E. Huff, J. M. Balog, and G. R. Bayyari, “Effect of gonadal steroids on bone and other physiological parameters of male broiler chickens,” Poultry Science, vol. 75, no. 4, pp. 556–562, 1996.
[20]  N. C. Rath, G. R. Huff, W. E. Huff, and J. M. Balog, “Factors regulating bone maturity and strength in poultry,” Poultry Science, vol. 79, no. 7, pp. 1024–1032, 2000.
[21]  C.-Y. Lin and J.-C. Hsu, “Comparison of some selected growth, physiological and bone characteristics of capon, slip and intact birds in Taiwan country chicken cockerels,” Asian-Australasian Journal of Animal Sciences, vol. 16, no. 1, pp. 50–56, 2003.
[22]  K. Chen, S. Tsay, D. Lo, F. Kuo, J. Wang, and P. W. Chiou, “Effects of caponization and testosterone on bone and blood parameters of SCWL male chickens,” Asian-Australasian Journal of Animal Sciences, vol. 20, no. 5, pp. 706–710, 2007.
[23]  G. W. Wilson, Wilson’s Practical Meat Inspection, Blackwell, Malden, Mass, USA, 4th edition, 2005.
[24]  H. Spencer, J. A. Friendland, and I. Lewin, Anabolic-Androgenic Steroids (Hand Book of Experimental Pharmacology), vol. 43, 1976.
[25]  J. C. Layfield, W. J. Owings, S. L. Balloun, and D. L. Miller, “Carcass composition and production criteria of surgical capons as affected by nutrition,” Poultry Science, vol. 51, no. 5, p. 1597, 1971.
[26]  J. F. Welter, “The effects of surgical caponization on production efficiency and carcass yield of roosters,” Poultry Science, vol. 55, no. 4, pp. 1372–1375, 1976.
[27]  K. L. Chen, C. P. Wu, and R. G. R. Chou, “Effect of caponization age on growth performance and post-mortem change in muscles of Taiwan country chicken,” Journal of Agricultural Association of China, vol. 1, no. 1, pp. 54–63, 2000.
[28]  S. M. Tsay, K. L. Chen, and P. W. S. Chiou, “Testosterone implantation on the bone characteristics in castrated male chickens,” in Proceeding of 11th AAAP Animal Science Congress , Kuala Lumpur, Malaysia. Asian-Australian Association of Animal Production Society, pp. 321–324, Kuala Lumper , Malaysia, 2004.
[29]  K. L. Chen, T. T. Chen, K. J. Lin, and P. W. S. Chiou, “The effects of caponization age on muscle characteristics in male chicken,” Asian-Australasian Journal of Animal Sciences, vol. 20, no. 11, pp. 1684–1688, 2007.

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