The authors would like to thank the management of Emirates Industry for Camel Milk and Products (EICMP, Dubai, UAE) for providing the facilities and supporting this research. We are also grateful to the staff of the company for monitoring deliveries, care of newborn camels and collection of data. The publication is supported by the EFOP-3.6.3-VEKOP-16-2017-00008 project. The project is co-financed by the European Union and the European Social Fund.
Abdallah, H. R. and Faye, B. (2012): Phenotypic classification of Saudi Arabian camel (Camelus dromedarius) by their body measurements. Emir. J. Food. Agric. 24 ,272–280.
Agarwal, S. P. , Khanna, N. D. , Agarwal, V. K. and Dwarakanath, P. K. (1987): Circulating level of oestrogen and progesterone in female camels (Camelus dromedarius) during pregnancy. Theriogenology 28 ,849–859.
Al-Bisher, B. E. (1998): Pregnancy and parturition in the camel (Camelus dromedarius) with particular reference to cervical dilatation. MVSc Thesis, King Faisal University, Saudi Arabia.
Almutairi, S. E. , Boujenane, I. , Musaad, A. and Awad-Acharari, F. (2010): Non-genetic factors influencing reproductive traits and calving weight in Saudi camels. Trop. Anim. Health Prod. 42 ,1087–1092.
Alves, K. , Schenkel, F. S. , Brito, L. F. and Robinson, A. (2018): Estimation of direct and maternal genetic parameters for individual birth weight, weaning weight, and probe weight in Yorkshire and Landrace pigs. J. Anim. Sci. 96 ,2567–2578.
- Search Google Scholar
- Export Citation
Alves, K. Schenkel, F. S. Brito, L. F. Robinson, A. 2018): Estimation of direct and maternal genetic parameters for individual birth weight, weaning weight, and probe weight in Yorkshire and Landrace pigs. J. Anim. Sci. 96 , 2567– 2578. 10.1093/jas/sky172
Bene, Sz . (2013): Performance test results of stallions of different breeds between 1998–2010 in Hungary. 6th paper: Population genetics parameters, breeding values [in Hungarian, with English abstract]. Állattenyésztés és Takarmányozás [Hung. J. Anim. Prod.] 62 ,21–36.
- Search Google Scholar
- Export Citation
Bene, Sz 2013): Performance test results of stallions of different breeds between 1998–2010 in Hungary. 6th paper: Population genetics parameters, breeding values [in Hungarian, with English abstract]. Állattenyésztés és Takarmányozás [Hung. J. Anim. Prod.] 62 , 21– 36.
Bene, Sz. , Benedek, Zs. , Nagy, Sz. , Szabó, F. and Polgár, J. P. (2014): Some effects on gestation length of traditional horse breeds in Hungary. J. Cent. Eur. Agric. 15 ,1–10.
Bene, Sz. , Szabó, F. , Polgár, J. P. , Juhász, J. and Nagy, P. (2020): Genetic parameters of birth weight trait in dromedary camels (Camelus dromedarius). Trop. Anim. Health Prod. 52 ,2333–2340.
Boldman, K. G. , Kriese, L. A. , Van Vleck, L. D. and Kachman, S. D. (1993): A manual for use of MTDFREML. A set of programs to obtain estimates of variances and covariances. USDA-ARS, Clay Center, NE, USA.
Bos, H. and Van der Mey, G. J. W. (1980): Length of gestation periods of horses and ponies belonging to different breeds. Liv. Prod. Sci. 7 ,181–187.
Bourdon, R. M. and Brinks, J. S. (1982): Genetic, environmental and phenotypic relationships among gestation length, birth weight, growth traits and age at first calving in beef cattle. J Anim. Sci. 55 ,543–553.
Bouwman, A. C. , Bergsma, R. , Duijvesteijn, N. and Bijma, P. (2010): Maternal and social genetic effects on average daily gain of piglets from birth until weaning. J Anim. Sci. 88 ,2883–2892.
Carnier, P. , Albera, A. , Dal Zotto, R. , Groen, A. F. , Bona, M. and Bittante, G. (2000): Genetic parameters for direct and maternal calving ability over parities in Piedmontese cattle. J Anim. Sci. 78 ,2532–2539.
Christmann, A. , Sieme, H. , Martinsson, G. and Distl, O. (2017): Genetic and environmental factors influencing gestation length and parturition conception interval in Hanoverian warmblood. Livest. Sci. 199 ,63–68.
Crews, D. H. (2006): Age of dam and sex of calf adjustments and genetic parameters for gestation length in Charolais cattle. J Anim. Sci. 84 ,25–31.
Cubas, A. C. , Berger, P. J. and Healey, M. H. (1991): Genetic parameters for calving ease and survival at birth in Angus field data. J. Anim. Sci. 69 ,3952–3958.
Elias, E. , Degen, A. A. and Kam, M. (1991): Effect of conception date on length of gestation in the dromedary camel (Camelus dromedarius) in the Negev Desert. Anim. Reprod. Sci. 25 ,173–177.
Ewert, M. , Lüders, I. , Böröcz, J. , Uphaus, H. , Distl, O. and Sieme, H. (2018): Determinants of gestation length in Thoroughbred mares on German stud farms. Anim. Reprod. Sci. 191 ,22–33.
Fábri, Zs. N. (2018): Endogenous and exogenous factors affecting the composition of raw camel’s (Camelus dromedarius) milk [in Hungarian]. PhD dissertation, Széchenyi István University, Mosonmagyaróvár, Hungary. pp. 64–74.
Goyache, F. , Gutiérrez, J. P. , Fernández, I. , Royo, L. J. and Álvarez, I. (2005): Genetic analysis of days open in beef cattle. Livest. Prod. Sci. 93 ,283–289.
Hansen, M. , Lund, M. S. , Pedersen, J. and Christensen, L. G. (2004): Gestation length in Danish Holsteins has weak genetic associations with stillbirth, calving difficulty, and calf size. Livest. Prod. Sci. 91 ,23–33.
- Search Google Scholar
- Export Citation
Hansen, M. Lund, M. S. Pedersen, J. Christensen, L. G. 2004): Gestation length in Danish Holsteins has weak genetic associations with stillbirth, calving difficulty, and calf size. Livest. Prod. Sci. 91 , 23– 33. 10.1016/j.livprodsci.2004.06.007
Harvey, W. R. (1990): User’s guide for LSLMW and MIXMDL PC-2 version Mixed Model Least-Squares and Maximum Likelihood Computer Program. The Ohio State University, Columbus, OH, USA.
Haywood, L. , Spike-Pierce, D. L. , Barr, B. , Mathys, D. and Mollenkopf, D. (2017): Gestation length and racing performance in 115 Thoroughbred foals with incomplete tarsal ossification. Equine Vet. J. 50 ,29–33.
Heck, L. , Clauss, M. and Sánchez-Villagra, M. R. (2018): Do domesticated mammals selected for intensive production have less variable gestation periods? Mamm. Biol. 88 ,151–155.
Henderson, C. R. (1975): Best linear unbiased estimation and prediction under a selection model. Biometrics 31 ,423–447.
Iwaisaki, H. , Tsuruta, S. , Misztal, I. and Bertrand, J. K. (2005): Estimation of correlation between maternal permanent environmental effects of related dams in beef cattle. J. Anim. Sci. 83 ,537–542.
Langlois, B. and Blouin, C. (2012): Genetic parameters for gestation length in French horse breeds. Livest. Sci. 146 ,133–139.
Lee, C. , Van Tassel, C. P. and Pollak, E. J. (1997): Estimation of genetic variance and co-variance components for weaning weight in Simmental cattle. J. Anim. Sci. 75 ,325–330.
Mujibi, F. D. N. and Crews, D. H. (2009): Genetic parameters for calving ease, gestation length, and birth weight in Charolais cattle. J. Anim. Sci. 87 ,2759–2766.
Musa, E. E. and Abu Sineina, M. E. (1976): Some observations on reproduction in the female camel (Camelus dromedarius). Acta Vet. Beograd 26 ,63–69.
Musa, H. H. , Shuiep, E. S. , Ibtisam, E. , El Zubier, M. and Chen, G. H. (2006): Some reproductive and productive traits of camel (Camelus dromedarius) in Western Sudan. J. Anim. Vet. Adv. 5 ,590–592.
Nagy, P. and Juhász, J. (2019): Pregnancy and parturition in dromedary camels I. Factors affecting gestation length, calf birth weight and timing of delivery. Theriogenology 134 ,24–33.
Nagy, P. , Skidmore, J. A. and Juhász, J. (2013): Use of assisted reproduction for the improvement of milk production in dairy camels (Camelus dromedarius). Anim. Reprod. Sci. 136 ,205–210.
Pérez, C. C. , Rodríguez, I. , Mota, J. , Dorado, J. , Hidalgo, M. , Felipe, M. and Sanz, J. (2003): Gestation length in Carthusian Spanishbred mares. Livest. Prod. Sci. 82 ,181–187.
Phocas, F. and Laloë, D. (2004): Genetic parameters for birth and weaning traits in French specialized beef cattle breeds. Livest. Prod. Sci. 89 ,121–128.
Ram, S. , Singh, B. and Dhandha, O. P. (1977): A note on genetic studies on gestation length, birthweight and intrauterine development index in Indian camel (Camelus dromedarius) and factors affecting them. Indian Vet. J. 54 ,953–955.
Rodrigues, J. A. , Gonçalves, A. R. , Antunes, L. , Bettencourt, E. V. and Gama, L. T. (2020): Genetic and environmental factors influencing gestation length in Lusitano horses. J. Equine Vet. Sci. 84 ,102850.
Sharma, S. S. and Vyas, K. K. (1971): Factors affecting gestation length in the Bikaneri camel (Camelus dromedarius). Ceylon Vet. J. 19 ,67–68.
Szőke, Sz. and Komlósi, I. (2000): Comparison of BLUP models [in Hungarian, with English abstract]. Állattenyésztés és Takarmányozás [Hung. J. Anim. Prod.] 49 ,231-246.
Trus, D. and Wilton, J. W. (1988): Genetic parameters for maternal traits in beef cattle. Can. J. Anim. Sci. 68 ,119–128.
Valera, M. , Blesa, F. , Dos Santos, R. and Molina, A. (2006): Genetic study of gestation length in Andalusian and Arabian mares. Anim. Reprod. Sci. 95 ,75–96.
Van Vleck, L. D. , Gregory, K. E. and Bennett, G. L. (1996): Direct and maternal covariances by age of dam for weaning weight. J. Anim. Sci. 74 ,1801–1805.
Willham, R. L. (1972): The role of maternal effects in animal breeding: III. Biometrical aspects of maternal effects in animals. J. Anim. Sci. 35 ,1288–1293.
Wray, N. R. , Quaas, R. L. and Pollak, E. J. (1987): Analysis of gestation length in American Simmental cattle. J. Anim. Sci. 65 ,970–974.
Yagil, R. and Etzion, Z. (1984): Enhanced reproduction in camels (Camelus dromedarius). Comp. Biochem. Phys. A 79 ,201–204.