Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/50266
Registro completo de metadados
Campo DCValorIdioma
dc.creatorPereira, M. N.-
dc.creatorMorais Júnior, N. N.-
dc.creatorOliveira, R. Caputo-
dc.creatorSalvati, G. G. S.-
dc.creatorPereira, R. A. N.-
dc.date.accessioned2022-06-20T16:43:46Z-
dc.date.available2022-06-20T16:43:46Z-
dc.date.issued2021-03-
dc.identifier.citationPEREIRA, M. N. et al. Methionine precursor effects on lactation performance of dairy cows fed raw or heated soybeans. Journal of Dairy Science, [S.l.], v. 104, n. 3, p. 2996-3007, Mar. 2021. DOI: 10.3168/jds.2020-18696.pt_BR
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/S0022030221000102pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/50266-
dc.description.abstractTwo experiments were conducted to evaluate the effect of isopropyl ester of 2-hydroxy-4-(methylthio) butanoic acid (HMBi) on lactation performance of dairy cows. Experiment 1 evaluated the effect of HMBi in diets with 15.3% crude protein (CP) and with different proportions of rumen-degradable and undegradable protein. Variation in rumen-degradable and undegradable protein was achieved by replacing raw with heated soybeans. Experiment 2 was an on-farm trial to evaluate HMBi with a large number of observations and using a farm-formulated diet (17.2% CP). In experiment 1, 20 Holsteins at 100 ± 41 d in milk were allocated to 5 replicated 4 × 4 Latin squares with 21-d periods. Treatments were formed by a 2 × 2 factorial arrangement of raw or heated soybeans with or without HMBi. Paper capsules with HMBi were orally administered twice daily to each cow. Dosage of HMBi was 7.6 g of digestible Met/cow per day. There was no interaction between soybean type and HMBi. Heat-treated soybeans increased the yields of milk, protein, fat, and lactose, and reduced urea N in milk and plasma (PUN) compared with raw soybeans. Rumen microbial yield, dry matter intake (DMI), and the total-tract apparent digestibility of nutrients did not differ between soybean types. There was no evidence for HMBi-driven effects on DMI, milk and components yield, or diet digestibility. Urinary purine derivative excretion and PUN concentration were reduced in HMBi-fed cows compared with cows fed diets without HMBi. In experiment 2, 294 Holstein cows were blocked by parity and milk yield, and randomly assigned to HMBi (8.9 g of digestible Met/cow per day) or control. The final data set had 234 cows (215 ± 105 days in milk; 96 primiparous and 138 multiparous; 114 on control and 120 on HMBi) housed in 4 freestall groups (1 group/treatment per parity). The freestall group was the experimental unit for DMI, diet and orts composition, and feed availability. The HMBi supplement was top dressed for 28 d on the first daily meal of each cow, immediately after feed delivery of the same batch of feed to all 4 freestall groups (3 times per day). Sample collection and feed analysis occurred during the last 5 d. Spot urine samples and blood samples from each cow were obtained for analysis of the urinary allantoin to creatinine ratio and PUN. Feed availability, the contents of CP and neutral detergent fiber in diets and orts, and DMI did not differ. Cows fed with HMBi had greater milk protein yield and concentration compared with control and had no change in milk fat and lactose. Rumen microbial yield was greater and PUN was lower in HMBi-fed cows compared with control. In experiment 1, HMBi decreased rumen microbial yield and did not affect lactation performance, but it increased ruminal microbial yield and the secretion of milk protein in experiment 2. These results suggest that lactation response to HMBi may be partially mediated by ruminal events. Heated soybeans increased the efficiency of N utilization and the yields of milk, protein, fat, and lactose, but did not interact with HMBi supplementation.pt_BR
dc.languageen_USpt_BR
dc.publisherElsevierpt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceJournal of Dairy Sciencept_BR
dc.subjectIsopropyl ester of 2-hydroxy 4-(methylthio)-butanoic acid (HMBi)pt_BR
dc.subjectMilk proteinpt_BR
dc.subjectPlasma urea nitrogenpt_BR
dc.subjectRumen microbial synthesispt_BR
dc.titleMethionine precursor effects on lactation performance of dairy cows fed raw or heated soybeanspt_BR
dc.typeArtigopt_BR
Aparece nas coleções:DZO - Artigos publicados em periódicos

Arquivos associados a este item:
Não existem arquivos associados a este item.


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.