Association between melatonin receptor 1A (MTNR1A) gene polymorphism and the reproductive performance of Mediterranean Italian buffaloes
S. Luridiana A , M. C. Mura A , M. Pazzola A , M. Paludo A , G. Cosso A , M. L. Dettori A , S. Bua A , G. M. Vacca A and V. Carcangiu A B
+ Author Affiliations
- Author Affiliations
A Dipartimento di Biologia Animale, Università degli Studi di Sassari, Via Vienna 2, 07100, Sassari, Italy.
B Corresponding author. Email: endvet@uniss.it
Reproduction, Fertility and Development 24(7) 983-987 https://doi.org/10.1071/RD11297
Submitted: 30 November 2011 Accepted: 8 February 2012 Published: 20 March 2012
Abstract
A melatonin receptor 1A (MTNR1A) gene polymorphism in adult buffaloes has been reported to affect reproductive seasonality. Consequently, the aim of the present study was to assess whether this polymorphism can affect age at first conception and the interval between first and second calving in Mediterranean Italian buffaloes. The allelic frequency of the C and T alleles was 0.44 and 0.56, respectively, whereas the genotypic frequency was 26% for C/C, 40% for C/T and 34% for T/T. The average age at first mating was approximately 20 months, whereas that at calving was approximately 32 months. The largest number of calvings of primiparous buffaloes was recorded between June and October. No associations between genotype, first mating and subsequent calving date were found. The duration from first to second calving was longer in buffaloes with the C/C genotype compared with those with the T/T and C/T genotypes (P < 0.01). The period of calving for buffaloes with the C/C genotype was mainly from July to September, whereas that for buffaloes with the T/T genotype was largely from March to May. The MTNR1A gene had no effect on the age of first conception in Mediterranean Italian buffaloes. Rather, the association between the T/T genotype and reproductive activity during days with a long photoperiod indicates that this polymorphism may be considered a genetic marker to identify buffaloes that are able to reproduce out of the breeding season.
Additional keywords: anaestrous, first conception, HpaI genotype, inter-calving period, seasonal reproduction.
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