Consulta: creatorFacets:"Pfeifer,Luiz Francisco Machado"
Registros recuperados: 9
Data/hora: 01/06/2024 02:07:40

The use of insulin to improve fertility of timed-inseminated postpartum suckled beef cows
Provedor de dados: 86
Autores: Schneider,Augusto; Pfeifer,Luiz Francisco Machado; Schmitt,Eduardo; Bianchi,Ivan; Vieira,Marcelo Brandi; Xavier,Eduardo Gularte; Del Pino,Francisco Augusto Burkert; Corrêa,Marcio Nunes.
The objective of this work was to evaluate the effect of insulin alone or in association with equine chorionic gonadotropin (eCG) on the fertility of postpartum beef cows subjected to synchronization. A total of 340 cows was subjected to fixed time artificial insemination. In the trial 1, the cows were subjected to temporary weaning (TW), while in the trial 2 the same protocol was tested without TW. The addition of an insulin injection to a progesterone/eCG-based protocol without TW increased the pregnancy rate of beef cows with body condition score (BCS) equal to or lower than 2.5. Insulin had no effect on cows submitted to TW or with BCS equal to or higher than 3.0.
Palavras-chave: Bos taurus; ECG; Insulin; FTAI; Weaning.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000023

Insulin-like growth factor and growth hormone receptor in postpartum lactating beef cows
Provedor de dados: 86
Autores: Schneider,Augusto; Pfeifer,Luiz Francisco Machado; Hax,Lucas Teixeira; Paludo,Giane Regina; Pino,Francisco Augusto Burkert Del; Dionello,Nelson José Laurino; Corrêa,Marcio Nunes.
The objective of this study was to evaluate the plasma concentrations of insulin-like growth factor-I (IGF-I), and the mRNA hepatic expression of IGF-I and of the growth hormone receptors GHR and GHR 1A, in postpartum beef cows. Four Angus and four crossbred (Angus x Nelore) postpartum suckled beef cows were used. Liver and blood samples were collected every 10 days, from calving to 40 days postpartum, for gene expression and for β-hydroxybutyrate and IGF-I assays, respectively. Samples for progesterone assay were collected every other day, from day 10 to 40 postpartum. Three cows ovulated before 40 days postpartum. IGF-I concentration was higher in Angus x Nelore than in Angus cows. There was no difference in the expression of GHR, GHR 1A and IGF-I...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bos indicus; Bos taurus; GHR; IGF-I; MRNA hepatic expression; Ovulation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000800019

Prostaglandin F2α or estradiol benzoate to induce ovulation in timed artificially inseminated dairy cows
Provedor de dados: 86
Autores: Pfeifer,Luiz Francisco Machado; Siqueira,Luiz Gustavo Bruno; Arashiro,Eduardo Kenji Nunes; Castro,Natália Ávila de; Viana,João Henrique Moreira.
Abstract: The objective of this work was to compare two types of ovulation inducers - estradiol benzoate (EB group) or prostaglandin F2α (PG group) -, in postpartum dairy cows subjected to timed artificial insemination (TAI). Lactating Holstein-Gir crossbred cows (n=118) with 60 to 120 days of milk production were used in this study. All cows were treated with an intravaginal progesterone-releasing device (CIDR) plus 2 mg of estradiol benzoate (EB) on day 0. The CIDR inserts were removed on day 9, and all cows received 500 µg sodium cloprostenol. Twenty-four hours after CIDR removal, cows were randomly assigned into two treatment groups and were given either 1 mg of EB i.m. (EB group) or 500 µg sodium cloprostenol i.m. (PG group). TAI were performed at 52...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artificial insemination; Cattle; Estrus; Synchronization; Withdrawal period.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000600738

Resultados econômicos da produção de cordeiros em confinamento utilizando na dieta casca de soja associada a quatro fontes de nitrogênio não-proteico
Provedor de dados: 96
Autores: Ziguer,Evâneo Alcides; Tonieto,Sandro Roberto; Pfeifer,Luiz Francisco Machado; Bermudes,Rogério Fôlha; Schwegler,Elizabeth; Corrêa,Marcio Nunes; Dionelllo,Nelson José Laurino.
O objetivo neste estudo foi avaliar o custo de produção e a resposta econômica da utilização de casca de soja (CS) associada a duas fontes de nitrogênio não-proteico (NNP) na terminação de cordeiros em confinamento. Foram utilizados 80 cordeiros mestiços Suffolk, com idade inicial de 69 ± 6 dias e peso vivo inicial de 23,11 ± 1,78 kg. Os animais foram distribuídos em quatro grupos, cada um com uma dieta formulada com uma fonte de NNP: grupo ureia convencional, na proporção de 1%; grupo ureia protegida, na proporção de 1%; grupo ureia protegida convencional, na proporção de 1% + 0,5% de ureia convencional, da dieta total, respectivamente; e grupo controle, sem fonte adicional de NNP. O custo total de produção do cordeiro até a desmama foi de R$...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Custos; Ovinos; Resposta econômica.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000900030

Efeito da duração do tratamento com progestágeno e da maturidade sexual na taxa de prenhez em novilhas de corte: avaliação econômica e biológica
Provedor de dados: 96
Autores: Pfeifer,Luiz Francisco Machado; Castilho,Eduardo Madeira; Roll,Victor Fernando Büttow; Schneider,Augusto; Ziguer,Evâneo Alcides; Dionello,Nelson José Laurino.
Os objetivos neste experimento foram avaliar o efeito do tempo de exposição a um progestágeno (P4) na taxa de prenhez de novilhas púberes e pré-púberes inseminadas em tempo-fixo (IATF) e estudar o retorno econômico dos protocolos utilizados, por meio da comparação desses protocolos ao sistema tradicional de acasalamento natural aos 26 meses de idade. Foram utilizadas 114 novilhas da raça Bradford com 16 meses de idade, classificadas em quatro grupos de acordo com o tratamento e a maturidade sexual: GPPLP - pré-puberes, longo tratamento com P4 (n=21); e GPPCP - pré-puberes, curto tratamento com (n=19); GPLP - púberes, longo tratamento com P4 (n=34); e GPCP - púberes, curto tratamento com P4 (n=40). As novilhas do GPPLP e GPLP receberam no dia -8 um pessário...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovinos; Progesterona; Puberdade; Rentabilidade; Sincronização de ovulação.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700007

Avaliação biológica e econômica do uso de flunixin meglumine em vacas e novilhas de corte inseminadas em tempo fixo
Provedor de dados: 96
Autores: Pfeifer,Luiz Francisco Machado; Schneider,Augusto; Silva Neto,José Wilson da; Ziguer,Evâneo Alcides; Dionello,Nelson José Laurino; Corrêa,Marcio Nunes.
Objetivou-se verificar a redução de perdas embrionárias por meio do bloqueio da secreção de prostaglandina com a utilização de flunixin meglumine (FM) e avaliar o retorno econômico desta técnica. No experimento 1, utilizaram-se vacas de corte no pós-parto e, no experimento 2, somente novilhas. Todas as fêmeas foram sincronizadas e inseminadas em tempo fixo (IATF) e, após 14 dias da IATF, foram distribuídas em dois grupos: grupo flunixin meglumine (GFM), composto de 59 vacas no experimento 1 e 23 novilhas no experimento 2; e grupo controle (GC), de 56 vacas no experimento 2 e 20 novilhas no experimento 1, que receberam ou não flunixin no dia 14, respectivamente. O tratamento com flunixin não influenciou a taxa de prenhez, que, no experimento 1, foi de 42,4%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antiinflamatório não-esteróide; Bovinos de corte; Mortalidade embrionária.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008000800008

Effect of the ovulatory follicle diameter and progesterone concentration on the pregnancy rate of fixed-time inseminated lactating beef cows
Provedor de dados: 96
Autores: Pfeifer,Luiz Francisco Machado; Leal,Sofia del Carmen Bonilla de Souza; Schneider,Augusto; Schmitt,Eduardo; Corrêa,Marcio Nunes.
The objective of this study was to evaluate the influence of the ovulatory follicle diameter on the reproductive performance of lactating beef cows subjected to low progesterone fixed-time artificial insemination (FTAI) protocols. Ninety-three lactating beef cows (60-80 days postpartum) at random stages of estrous cycle were given a luteolytic dose of prostaglandin F2α (500 μg cloprostenol; PGF) twice, 11 d apart. Ten days after the second PGF treatment, cows were given 1.5 mg of estradiol benzoate im and a progesterone-releasing intravaginal device (Cue-Mate) with a single pod containing 0.78 g progesterone (Day 0). Cows received another luteolytic dose of PGF on Day 0. On Day 8, the Cue-Mate was removed. Fifty-four to 56 hours later, cows received 12.5...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corpus luteum; Fertility; Post-partum cows; Progesterone.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000400024

Performance and metabolic pattern of feedlot lambs using soyabean hulls associated to different non-protein nitrogen sources
Provedor de dados: 96
Autores: Ziguer,Evaneo Alcides; Roll,Victor Fernando Büttow; Bermudes,Rogério Fôlha; Montagner,Paula; Pfeifer,Luiz Francisco Machado; Del Pino,Francisco Augusto Burkert; Corrêa,Marcio Nunes; Dionello,Nelson José Laurino.
The aim of this study was to evaluate the metabolic profile of the use of soyabean hulls associated with two sources of non-protein nitrogen (NPN) on the finishing of feedlot lambs. Eighty crossbred Suffolk non-castrated lambs aging 69±6 days and weighing 23.11±1.78 kg were used. Lambs were randomly allocated into 4 experimental groups according to the NPN source: conventional urea (1%); protected urea; 1% protected urea + 0.5% conventional urea; and a control group, which did not receive urea supplementation. Blood samples were collected weekly to determine the plasma concentrations of urea, albumine, γ-glutamiltransferase (GGT), calcium and phosphorus. The control group had higher average daily gain and final weight than protected urea and protected urea...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biochemical analysis; Feeding; Performance; Urea.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200030

Diets Rich in Polyunsaturated Fatty Acids With Different Omega-6/Omega-3 Ratio Decrease Liver Content of Saturated Fatty Acids Across Generations of Wistar Rats
Provedor de dados: 52
Autores: Halfen,Simone; Jacometo,Carolina Bespalhok; Mattei,Patrícia; Fenstenseifer,Samanta Regine; Pfeifer,Luiz Francisco Machado; Pino,Francisco Augusto Burkert Del; Santos,Marco Aurélio Ziemann; Pereira,Cláudio Martin Pereira de; Schmitt,Eduardo; Corrêa,Marcio Nunes.
Our study evaluated how the consumption of diets with low (LOW group - 0.4/1) or high (CON group - 13.6/1) omega-6/omega-3 ratio across generations (F1 and F2) can modulate liver fatty acid (FA) profile and blood biomarkers. Liver content of α-linolenic acid was higher in animals always fed with LOW diet than animals that changed from CON to LOW diet, which by your time was higher than animals always fed with CON diet. Liver saturated FA concentration decreased in both groups from F1 to F2. In conclusion, both diets were efficient in decreasing the saturated FA liver content across generations, the LOW ratio diet was more effective in reducing blood triglycerides and non-esterified fatty acids, and there was a multigenerational effect of the LOW ratio...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha-linolenic acid; Essential fatty acid; Lipid; Metabolism; Nutrition; Rats.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100503