Data/hora: 07/06/2024 13:05:30

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 01/08/1992
Data da última atualização: | 31/03/2023
Autoria: | HARVEY, T. G.; JOHNSON, D. L.; BAKER, R. L.; TRUST, B. K.; JOHNSON, B. C.
Título: | Artificial insemination in sheep comparison of storage time, dose, rate and insemination technique.
Ano de publicação: | 1986
Fonte/Imprenta: | Proceedings of the New Zealand Society of Animal Production,, v. 46, p. 229-232, Jan. 1986.
Idioma: | Inglês
Conteúdo: | Abstract: Trials undertaken at Rotomahana in 1984 and 1985 examined factors involved in sheep AI and provided a link between Rotomahana and a commercial AI programme. Semen collected and diluted by the New Zealand Dairy Board gave similar conception rates (46%) to semen collected at Rotomahana (42%). Results in 1984 indicated that there was a small but non-significant decrease in conception rate with semen storage time up to 15 hours (5 h 68%, 10 h 61%, 15 h 57%). In 1985 there was a highly significant difference between 5 and 20 h storage (46% v 25%) and this result was consistent over ewe ages and dose rate. In 1985, 200x106 sperm dose was compared to 100x106 dose in 3 subtrials. The overall conception rates were 45.7% and 37.5% respectively (P<0.05). In 1984 diluted semen stored in glass and inseminated using a fine glass pipette gave a higher, but not significant, conception rate than semen stored in mini straws and inseminated using a standard cattle pistollet (66% v 58%). In 1985 all semen was stored in glass and inseminated with either a glass pipette (conception rate of 49.8%) or a cattle pistollet (43.2%). This difference was non-significant, although there was a significant interaction of insemination equipment with dose rate. A significantly higher conception rate was achieved for cervical (52.8%) than blind insemination (29%) when ewes were inseminated `on time` in 1985 and this effect was consistent over dose rate. There was no difference in conception rate when `on-oestrus` insemination was compared to `on-time` (63% v 61%). All first-order interactions among the effects of storage time, insemination method and `on-oestrus` v ` on-time` were non-significant in the 1984 trial.
Palavras-Chave: | Al; CIDR.
Thesagro: | Inseminação Artificial; Ovino; Reprodução; Sêmen.
Thesaurus Nal: | Artificial insemination; Estrus synchronization; Reproduction; Sheep.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (7802-1) - ADD - AP - DD -  -  -  - DIS