The Reproductive Organs in Malnutrition Effects of Chorionic Gonadotropin Upon Atrophic Genitalia of Underfed Male Rats

The Influence of Feed Restriction and Subsequent Re-Feeding on Gonadotrophin Secretion and Serum Testosterone Levels in Male Rats

“…Recent work by Grewal et al (1971) has shown that the reduced accessory gland weights are associated with reduced serum levels of testosterone. Although under¬ feeding appears to have its greatest effect on the steroid-secreting activity of the testes (Berliner & Ellis, 1965;Grewal et al, 1971), reduced testicular weights have also been reported (Mulinos & Pomerantz, 1941;Berliner & Ellis, 1965;Grewal et al, 1971). The process of spermatogenesis, however, appears to be little affected by underfeeding since Grewal et al (1971) (Howland, 1971(Howland, , 1972Gombe et al, 1973), but serum levels of FSH were not affected by underfeeding (Howland, 1971).…”

“…Restricted feed intake has been reported to reduce the weight of accessory sex glands (Moore & Samuels, 1931 ;Mulinos & Pomerantz, 1941; Quimby, 1948;Berliner & Ellis, 1965;Grewal et al, 1971). Recent work by Grewal et al (1971) has shown that the reduced accessory gland weights are associated with reduced serum levels of testosterone.…”

Effect of underfeeding on the inhibition of gonadotrophin secretion by testosterone propionate in rats

“…The reduced stimulation of Leydig cells presumably accounts, in part, for the reduced serum levels of testosterone (Grewal, Mickelsen & Hafs, 1971;Howland, 1975) and thus is indirectly responsible for the reduced accessory sex gland weights that are characteristic of underfed rats (Moore & Samuels, 1931;Mulinos & Pomerantz, 1941a; Quimby, 1948;Berliner & Ellis, 1965;Grewal et al, 1971;Howland, 1975). In female rats there is evidence that underfeeding causes reduced LH secretion by increasing the sensitivity of the hypothalamus or pituitary gland to the inhibitory effect of oestrogen (Howland & Ibrahim, 1973).…”

A review of nutritional influences on reproduction in boars, bulls and rams

“…On the other hand, several workers have reported that rams fed sub-maintenance diets exhibited reduced sexual activity (Parker and Thwaites, 1972;Mattner and Braden, 1975;Alkass and Bryant, 1984) and it was concluded that if a diet supplied adequate energy, a high protein supplement would have no beneficial effect on sexual motivation (Mattner and Braden, 1975 (Mattner and Braden, 1975 (Davies et al, 1957). Further, in underfed male rats (Mulinos and Pomerantz, 1941) and dogs (Pazos and Huggins, 1945) (Lindsay et al, 1984). Similarly, a significant decrease in LH pulses was also observed in rams fed a low energy ration compared with those on a maintenance diet (Martin et al, 1989 (Campbell et al, 1977;Beal et al, 1978;Gauthier and Berbigier, 1982) suggests that the reduction in LH pulsatility observed in the slower growing underfed animals may be due primarily to a decrease in release of hypothalamic hormones that control anterior pituitary function (Campbell et al, 1977;Gauthier and Berbigier, 1982 (HoHiland, 1975).…”