Luiz Francisco Machado Pfeifer

Efeito da duração do tratamento com progestágeno e da maturidade sexual na taxa de prenhez em novilhas de corte: avaliação econômica e biológica

The aim of this experiment was to evaluate the effect of the duration of progestagen (P4) exposure and sexual maturity of prepubertal and pubertal heifers submitted to timed artificial insemination (TAI). A hundred and fourteen 16- month old Bradford heifers were classified, according treatment and sexual maturity, in 4 groups: PPLPG (prepubertal long exposure to P4, n=21), PPSPG (prepubertal short exposure to P4, n=19), PLPG (pubertal long exposure to P4, n=34) and PSPG (pubertal short exposure to P4, n=40). On day -8, the heifers from PPLPG (prepubertal long exposure to progestagen) and PLPG (pubertal long exposure to progestagen) received an intravaginal sponge impregnated with medroxiprogesterone acetate (MAP). On day 0 the sponge was removed and a new sponge was inserted, together with an injection of 2.5 mg estradiol benzoate (EB). On day 8 the sponge was removed and the heifers received an injection of 0.5 mg EB and 250 ig sodium cloprostenol. The TAI was performed 54 hours after sponge withdrawal. The heifers from PPSPG and PSPG received the same synchronization treatment, except for the additional MAP from day -8 to day 0. The pregnancy rate was higher in pubertal (60.3%) than in pre-pubertal (35.0%) heifers. However, there was no effect of the duration of treatment in the pregnancy rate between pubertal and prepubertal heifers. The second part of this study aimed to evaluate the economical return of the protocols and compare them with the traditional breeding system at 26 months of age. A better economic response with the use of protocols associating P4 in heifers at 16 months was observed compared to the traditional system at 26 months of age. The prolonged exposure to P4 did not improved pregnancy rate in heifers submitted to TAI.

Effect of butaphosphan and cyanocobalamin on postpartum metabolism and milk production in dairy cows

The aim of this study was to determine the effect of butaphosphan and cyanocobalamin (BTPC) supplementation on plasma metabolites and milk production in postpartum dairy cows. A total of fifty-two Holstein cows were randomly assigned to receive either: (1) 10 ml of saline (NaCl 0.9%, control group); (2) 1000 mg of butaphosphan and 0.5 mg of cyanocobalamin (BTPC1 group); and (3) 2000 mg of butaphosphan and 1.0 mg of cyanocobalamin (BTPC2 group). All cows received injections every 5 days from calving to 20 days in milk (DIM). Blood samples were collected every 15 days from calving until 75 DIM to determine serum concentration of glucose, non-esterified fatty acids (NEFA), β-hydroxybutyrate (BHB), cholesterol, urea, calcium (Ca), phosphorus (P), magnesium (Mg), aminotransferase aspartate (AST) and γ-glutamyltransferase (GGT). The body condition score (BCS) and milk production were evaluated from calving until 90 DIM. Increasing doses of BTPC caused a linear reduction in plasma concentrations of NEFA and cholesterol. Supplementation of BTPC also reduced concentrations of BHB but it did not differ between the two treatment doses. Milk yield and milk protein had a linear increase with increasing doses of BTPC. A quadratic effect was detected for milk fat and total milk solids according to treatment dose, and BTPC1 had the lowest mean values. Concentrations of glucose, urea, P, Mg, AST, GGT, milk lactose and BCS were not affected by treatment. These results indicate that injections of BTPC during the early postpartum period can reduce NEFA and BHB concentrations and increase milk production in Holstein cows.

Resultados econômicos da produção de cordeiros em confinamento utilizando na dieta casca de soja associada a quatro fontes de nitrogênio não-proteico

The aim of this study was to evaluate the production costs and economic return of soybean husks (CS) associated with two non-protein nitrogen (NNP) sources, in feedlot finishing lamb. Eighty (80) Suffolk cross lambs, averaging initial age of 79 ± 6 days and initial live weight of 23.11 ± 1.78 kg were used. The animals were grouped in four experimental lots accordingly to NNP source: conventional urea group (CUG, n = 20), which received 1% of common urea; protected urea group (PUG, n = 20), which received 1% of protected urea, at the ratio of 1% + 0.5% conventional urea, of total diet, respectively; and control group, with no additional source of NNP. Total production cost (CT) of lambs at weaning was R

O nível de colesterol influencia a quantidade de folículos na punção folicular de vacas de corte

85.27/animal. In this cost ewes contributed with 68.55%, followed by the lamb cost (0-67 days), which represented 25.57% and rams with only 5.88%. The average CT in feedlot finishing was of R

Avaliação biológica e econômica do uso de flunixin meglumine em vacas e novilhas de corte inseminadas em tempo fixo

57.73/lamb. Effective operational cost (COEf) represented R

Desempenho e perfil metabólico de cordeiros confinados utilizando casca de soja associada a diferentes fontes de nitrogênio não-proteico

57.35 or 99.33% of CT finishing. Variables of higher representativeness of COEf were: ration (61.56%) and taxes (31.06%). Diets with higher positive gross margin (MB)/lamb were GUC and CG (R

EFEITO DAS TÉCNICAS TRANSCERVICAL E LAPAROSCÓPICA SOBRE A TAXA DE PRENHEZ DE OVELHAS INSEMINADAS EM TEMPO-FIXO

1.77 and R

Factors that affect the in vitro production of bovine embryos: A review

44.35), respectively. All diets presented negative net margin (ML) and economic return (RE). In finishing systems of feedlot lamb, the use of diets with no additional source of non-protein nitrogen is the option that allows better economic and productivity results.The aim of this study was to evaluate the production costs and economic return of soybean husks (CS) associated with two non-protein nitrogen (NNP) sources, in feedlot finishing lamb. Eighty (80) Suffolk cross lambs, averaging initial age of 79 ± 6 days and initial live weight of 23.11 ± 1.78 kg were used. The animals were grouped in four experimental lots accordingly to NNP source: conventional urea group (CUG, n = 20), which received 1% of common urea; protected urea group (PUG, n = 20), which received 1% of protected urea, at the ratio of 1% + 0.5% conventional urea, of total diet, respectively; and control group, with no additional source of NNP. Total production cost (CT) of lambs at weaning was R

Efeito da adição de glucomanano modificado em dietas contendo aflatoxina sobre parâmetros clínicos de ovinos

85.27/animal. In this cost ewes contributed with 68.55%, followed by the lamb cost (0-67 days), which represented 25.57% and rams with only 5.88%. The average CT in feedlot finishing was of R

Milk production and metabolic markers in Holstein dairy cows with clinical and subclinical mastitis.

57.73/lamb. Effective operational cost (COEf) represented R