Consulta: subjectFacets:"Conception rate"
Registros recuperados: 6
Data/hora: 06/06/2024 04:26:14

Effect of Bovine Somatotropin Administration on Day 11 after Artificial Insemination in Estrus-Induced Ewes during the Non-Breeding Season
Provedor de dados: 19
Autores: Fukui, Yutaka; Yamamura, Kunio; Matsunaga, Nobuyoshi; Miyamoto, Akio; 福井, 豊; 宮本, 明夫.
The present study aimed to examine the possibility that bovine somatotropin (BST) treatment after artificial insemination (AI) may improve the fertility by the stimulation of corpus luteum (CL) function in seasonally anestrous ewes. The experiment was conducted at the Tawa Field Station, Shibecha-cho in Hokkaido, Japan, during the non-breeding season (May, 1995). Eighty-nine mature (2 to 3 years old) Suffolk and Suffolk-crossed ewes were treated with controlled internal drug release devices containing 0.3 g progesterone (CIDR-G) for 12 days. Ewes were injected intramuscularly with 500 IU PMSG the day before CIDR removal. Eighty-seven ewes were assigned to an insemination of frozen semen on a fixed-time basis (42 to 50 h) after removal of CIDR. On the 11th...
Palavras-chave: Bovine somatotropin; Artificial insemination; Progesterone; Conception rate; Ewes.
Ano: 2000
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2971

Age at first calving and factors influencing it in dairy heifers kept by smallholder farmers in Southern Malawi
Provedor de dados: 19
Autores: Watanabe, Keitaro; Lewis, Brian; Mlewah, Taurayi Belo; Tetsuka, Masafumi.
Delayed age at first calving (AFC) is known to decrease productivity in dairy cattle. In the present study, we investigated AFC in heifers kept by smallholder farmers in southern Malawi and the reproductive factors influencing it. Data were obtained for 1,620 heifers over a 13-year period from 1999 to 2012. The age at first service (AFS), first service to conception interval (FSCoI), number of services per conception (NSC), conception rate (CR) and service interval (SI) were investigated in relation to AFC. The median AFC was found to be 41 months. This is a relatively high value and shows no improvement from the values reported in the 1970s and 1980s. The median AFS was also high (23 months). Overall, the 1st service CR was 42%, and the median SI was 83...
Palavras-chave: Age at first service; Conception rate; Service interval.
Ano: 2017
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4566

Reproductive performance of Santa Inês ewes fed protected fat diet
Provedor de dados: 86
Autores: Costa,Ricardo Lopes Dias da; Fontes,Reginaldo da Silva; Cunha,Eduardo Antonio da; Bueno,Mauro Sartori; Quirino,Celia Raquel; Afonso,Vivian Alves Costa; Otero,Walter Guimarães; Santos,Luis Eduardo dos; Dias,Ângelo José Burla.
The objective of this work was to evaluate the reproductive performance of Santa Inês ewes fed a diet supplemented with protected fat. Intervals from lambing to first clinical estrus and to conception, conception rate, prolificacy, live weight and body condition were determined. After lambing, 60 ewes and their offsprings were weighted and randomly assigned to three treatments, based on age, body weight and number of born lambs. Treatments consisted of: control diet, or control diet plus 30 g of protected fat, from lambing to day 25 of post-lambing (Sup25), or to day 60 of post-lambing (Sup60). Out of 60 evaluated ewes, 93.3% returned to estrus, and 74.5% got pregnant, with 73.53% lambing rate and 196.5 days lambing interval. The average periods from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ovis aries; Conception rate; Estrus; Lambing interval; Nutrition.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000600013

Use of human intravaginal tampon embedded with natural progesterone induces synchronous estrus in Santa Inês ewes
Provedor de dados: 45
Autores: Prates,J.F.; Brair,V.L.; Maia,A.L.R.S.; Souza-Fabjan,J.M.G; Brandão,F.Z.; Bonato,G.C; Fonseca,J.F.
RESUMO Este estudo avaliou a eficiência de três protocolos de indução de estro síncronizado em ovelhas da raça Santa Inês. Vinte e quatro ovelhas adultas foram equitativamente distribuídas em três grupos, de acordo com ordem de parto, peso corporal (kg) e escore da condição corporal. As ovelhas receberam implante vaginal de progesterona natural por seis dias mais 37,5μg de d-cloprostenol laterovulvar e 300UI de eCG i.m., 24 horas antes da remoção do dispositivo. Ovelhas controle receberam CIDR330mg de progesterona, e as demais receberam dispositivo absorvente intravaginal humano, tamanho mini, embebido com 200 (OB200) ou 400mg (OB400) de progesterona. Coletas de sangue foram feitas nos momentos D0 (antes da inserção dos dispositivos), D0+6h e diariamente,...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Progestagen; Transition period; Estrus induction; Conception rate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000100345

Serum progesterone concentration and conception rate of beef cows supplemented with ground corn after a fixed-time artificial insemination protocol
Provedor de dados: 45
Autores: Pescara,J.B.; Sá Filho,O.G.; Losi,T.C.; Cooke,R.F.; Vasconcelos,J. L. M.
The effects of different levels of finely ground corn (FC) supplementation to grazing beef cows after fixed-time AI (TAI) on serum progesterone (P4) concentrations on day 7 and conception rates on day 28 after TAI were investigated. Three hundred and sixty-four lactating multiparous Brangus cows had follicular and luteal activity synchronized by treatment with estradiol benzoate (Estrogin; 2.0mg IM) and insertion of intra-vaginal P4 releasing device (CIDR) on day -11, followed by treatment with PGF2α (Lutalyse; 25mg IM) on day -4, CIDR and calf removal on day -2, and treatment with GnRH (Fertagyl; 100µg IM) TAI and calf return on day 0. On day 0, cows were randomly allotted in one of the following FC supplement treatments: G1 - 2kg/day from day 0 to 21; G2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cow; Conception rate; Energy intake; Progesterone.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352010000100018

Management and nutrition strategies to reduce the breeding season in beef cows
Provedor de dados: 62
Autores: MEIRELLES,Cyro Ferreira; VITTI,Dorinha Miriam Silber Schmidt; ABDALLA,Adibe Luiz.
Effects of temporary calf removal and phosphorus supplementation on conception rate in a 60 or 120 day breeding season period was observed in several trials conducted over three years on Nelore cows. Experiment I involved 47 acyclic Nelore cows with suckling calves ranging in age from 55 to 70 days. Calves were temporarily removed from their dams for 48 h at the beginning of the trial or stayed with the dams throughout the trial. The proportion of cows that cycled during the breeding season was 5 out of 25 (20%) in the control group and I5 out of 22 (68%) in the group whose calves had been removed (p&lt;0.05). In Experiment II, 66 acyclic Nelore cows, averaging 60 ± 0.57 (x ± SE) days post-partum were allocated at random in three groups as follows: A,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nelore cows; Restricting suckling; Mineral supplements; Conception rate.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961998000300010