Response of sows to estradiol benzoate after weaning.
Estradiol benzoate (E2B) was intramuscularly injected in 3 groups of weaned sows at a dose of 0.2 mg/head on day 0 and on day 2 and at a dose of 0.4 mg/head on day 2, respectively. The blood concentration of LH rose to a peak 60-66 hr after E2B injection. The rates of the occurrence of estrus after E2B treatment in these groups were 85.7, 89.5 and 87.5%, respectively, with no significant differences compared to the control except for the second group. The farrowing rates in the 3 treated groups were 100, 86.8 and 61.9%, respectively, and the value in the third group was significantly lower compared to the control (p < 0.05). There were no significant differences in average litter size between the control and any of the treated groups.
Ogasa
A
A
Department of Animal Reproduction, Nippon Veterinary and Animal Science University, Tokyo, Japan.
Tsutsui
T
T
Kawakami
E
E
D000818:Animals; D004347:Drug Interactions; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D005298:Fertility / Q000187:drug effects*; D006064:Gonadotropins, Equine / Q000494:pharmacology; D007273:Injections, Intramuscular; D008098:Litter Size / Q000187:drug effects; D007986:Luteinizing Hormone / Q000097:blood*; D010053:Ovary / Q000187:drug effects / Q000502:physiology; D011247:Pregnancy; D012016:Reference Values; D013552:Swine / Q000502:physiology*; D013997:Time Factors; D014886:Weaning
D006064:Gonadotropins, Equine; D004958:Estradiol; D007986:Luteinizing Hormone