that the intervals between each mount was longer in the summer, which infests the obvious, that there were fewer mounts throughout the day. Stressors, especially heat stress, can also affect an animals’ feed intake which in turn affects their potential to produce meat and milk. For example, using measurements of feed intake and the effects on differences in endocrine functions as a basis, Holstein cows fed ad libitum under heat stress consumed four pounds less per day compared to their counterparts under thermally comfortable conditions. Lower concentrations of plasma somatotropin and higher concentrations of IGF-II were proposed to be involved in these effects of heat stress on dietary consumption