his investigation was to estimate the impact of daily oral treatments with some organic antioxidants as selenomethionine (Se-M) and zincmethionine (Zn-M), separately or together (Se-M plus Zn-M) to Fresian bulls through 150 days upon some blood components, libido, characteristics of fresh semen and frozen-semen thawed at various thawing regimes, as well as, fertilizing ability of bulls spermatozoa. Sixteen healthy Friesian bulls were separated into 4 groups. Bulls in the first, second, third and fourth groups were fed a basal diet, and given oral dose of 0, 0.3 mg Se-M, 4mg Zn-M, and 0.15mg Se-M plus 2mg Zn-M/kg of DM/bull/daily, respectively, for 150 days. The results elucidated that bulls were given Se-M plus Zn-M had optimal (P<0.01) values of hematological aspects, differential of leukocytic count, blood plasma testosterone, seminal plasma initial fructose, libido, as well as, physical aspects of fresh semen and frozen-semen thawed at various thawing rates comparing with the control or other treated bulls. Frozen-semen thawed at 55ºC for 15 seconds (rapid thawing rate) had best (P<0.01) quality, freezability and some biochemical components of seminal plasma and fertilizing ability of spermatozoa. In conclusion, daily oral dose of 0.15mg Se-M plus 2mg Zn-M/Kg DM/bull, as organic antioxidants through 150 days, could be suitable treatment for Friesian bulls, to achieving optimal quality of fresh semen production and freezability of semen, as well as, fertility of bulls spermatozoa, especially when frozen-semen thawed at 55º C for 15 seconds.
The present study aimed to determine the influence of equine chorionic gonadotropin (eCG), L-Carnitine (LC) and Royal jelly (RJ) treatments on milk production and subsequent reproductive performance of lactating NZW rabbits. A total 28 primiparous lactating New Zeland white (NZW) rabbits divided randomly into four groups (7 animals/ group): Group 1 (eCG group) on day 9 postpartum the females were treated with 50 IU eCG IM/ animal at 48 hrs before mating. Group 2 (LC group): the rabbits were given 50 mg LC /kg. BW/ day for 21 days orally starting at 24 hrs of parturition. Group 3 (RJ group) before mating the rabbits were given 100 mg RJ/ kg. BW/ day for 21 days orally starting at 24 hrs of parturition. Group 4 was Control group (without any treatment). The reproductive parameters including receptivity, conception and kindling rate as well as litter size and weight at weaning (LSW & LWW) and pre-weaning mortality (PWM) were recorded. The results revealed that there were no significant differences in the number of services per conception, conception and kindling rate among eCG, LC, RJ and control groups. Milk production, LSW and PWM were significantly improved after LC or RJ compared to eCG and control. In conclusion, the non-hormonal treatment (LC or RJ) supplementation can improve milk production and this positively reflected on LSW, LWW and PWM.
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