[Influence of somatotropin treatment on the reproduction function in the dairy cow]

Currently somatotropin in being developed for use in several animal species, primarily as a productivity enhancer. The objective of this paper was to review direct and indirect effects of somatotropin supplementation on reproduction particularly in the dairy cow. There is substantial evidence that somatotropin plays an important role in the normal ovarian function. This effect is probably mediated via IGF-I. Existing literature indicates that higher milk yields are antagonistic to reproductive performance and require enhanced nutrition and reproductive management. Similarly, studies indicate that reproductive performance may be impaired in diary cattle supplemented with somatotropin. Effects of somatotropin treatment on reproductive performance may depend on the dose and the stage of lactation. Low doses of somatotropin in early lactation may improve reproductive function.