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However, densitometry analysis of western blot bands only revealed differences between seasons in the Creole rams for MT1 and the Romney Marsh rams for MT2, whereas differences between breeds were only detected for MT2. It could be inferred that melatonin receptors in rams subjected to an equatorial photoperiod might be more closely related to sperm quality than seasonal control. Therefore, the presence of these receptors suggests that melatonin could be a useful tool to increase the fertility of rams located in tropical or equatorial clima