“…Various studies have shown that in small ruminant (sheep and goats) variations in energy balance, defined as the difference between the pool of disposable energy and the pool of expended energy, can influence any of the three levels of the reproductive axis (hypothalamus, pituitary gland, gonads) and also impact on regulatory feedback mechanisms [1,4,20]. And also, Jaborek et al [18] recommend that availability of energy has a key role on reproductive efficiency, because of the reproductive axis sensitivity to the adequacy of stores and nutrition of metabolic reserves.…”