Monensin for Lactating Dairy Cows Grazing Mixed-Alfalfa Pasture and Supplemented with Partial Mixed Ration

Gallardo, M.; Castillo, Alejandro; Bargo, F.; Abdala, Alejandro Ariel; Maciel, Martin Guillermo; Perez-Monti, H.; Castro, Helena Carla; Castelli, M.E.

doi:10.3168/jds.s0022-0302(05)72728-4

Cited by 37 publications

(29 citation statements)

References 23 publications

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“…Gallardo et al (2005) also reported positive effect by adding monensin, which increased milk yield by 4.0% in comparison to the control diet (27.7 vs. 26.6 kg/day, respectively). Eifert et al (2005) did not find any effect for milk yield when comparing the experimental diets, although the diet with monensin resulted in a higher value for milk yield (3.0%), in comparison with the control diet (26.5 vs. 26.6 kg/day, respectively).…”

Section: Resultsmentioning

confidence: 92%

Productive performance and milk protein fraction composition of dairy cows supplemented with sodium monensin

et al. 2010

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-The objective of this work was to evaluate the levels of sodium monensin on lactating cows and their effects on productive performance and milk protein fraction composition. It was used 12 Holstein cows, distributed in four balanced 3 × 3 Latin squares, and fed three diets: one control without monensin, and two diets with monensin at the levels of 24 or 48 mg/kg DM added to the concentrate. Milk production was daily measured throughout the entire experimental period. The samples used for analysis of milk composition were collected on two alternated days from the two daily milking. Non-protein nitrogen, total nitrogen and non-casein nitrogen contents were directly evaluated in the milk, and casein, whey protein and true protein contents were indirectly determined. The use of monensin in the rations reduced dry matter and nutrient intake, especially when diet with 48 mg/kg of dry matter was given. The ration with 24 mg/kg of DM increased milk production, with or without correction, and also fat and lactose yield, and it improved productive efficiency. The levels of monensin in the ratios did not influence contents of milk crude protein, non-protein nitrogen, non-casein nitrogen, true protein, casein, casein/ true protein ratio, whey protein, and of all those fractions expressed as percentage of crude protein. The utilization of monensin in the ratio at the dose of 24 mg/kg of DM influences positively the productive performance of lactating cows, and it does not influence the composition of milk protein fractions.Key Words: casein, dairy cows, ionophores, milk yield and composition, productive efficiencyDesempenho produtivo e composição da fração protéica do leite em vacas sob suplementação com monensina sódica RESUMO -Objetivou-se avaliar níveis de monensina sódica para vacas em lactação e seus efeitos no desempenho produtivo e na composição da fração protéica do leite. Foram utilizadas 12 vacas da raça Holandesa, distribuídas em quatro quadrados latinos 3 × 3 balanceados e alimentadas com três rações: uma controle sem monensina, e duas com monensima nos níveis de 24 mg/kg de matéria seca ou 48 mg/kg MS adicionada ao concentrado. A produção de leite foi mensurada diariamente durante todo o período experimental. As amostras utilizadas para análise da composição do leite foram coletadas em dois dias alternados e provenientes das duas ordenhas diárias. Foram analisados no leite os teores de nitrogênio não-protéico, nitrogênio total e nitrogênio não-caseinoso e indiretamente os teores de caseína, proteína do soro e proteína verdadeira. A utilização de monensina nas rações ocasionou redução do consumo de MS e de nutrientes, especialmente quando fornecida a ração com 48 mg/kg de MS. A ração com 24 mg/kg de MS promoveu aumento da produção de leite, sem e com correção, e da produção de gordura e lactose e aumento da eficiência produtiva. Os níveis de monensina nas rações não influenciaram os teores de proteína bruta, nitrogênio não-protéico, nitrogênio não-caseinoso, proteína verdadeira, caseína, relação caseína...

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Section: Resultsmentioning

confidence: 92%

Productive performance and milk protein fraction composition of dairy cows supplemented with sodium monensin

et al. 2010

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“…The day after, the remaining pasture was measured. Consumption was estimated by the difference between offered and refused pasture (Gallardo et al 2005).…”

Section: Measurementsmentioning

confidence: 99%

Diet and cooling interactions on physiological responses of grazing dairy cows, milk production and composition

Gallardo

Valtorta

Leva³

et al. 2005

Int J Biometeorol

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The objective of this trial was to evaluate the effects of diet and cooling in the holding pen before milking on rectal temperature, respiration rate and milk production and composition. Fifty-eight lactating Holstein cows were used in a factorial split-plot design, at Rafaela Experimental Station from 12 January to 3 March 2003. The treatments were combinations of two diets: control (CD) and balanced (BD) with two levels of cooling before milking: none (NSF) and a sprinkler and fans (SF). Forage:concentrate ratios for CD and BD were 81:19 and 68:32, respectively. Cows were milked twice daily. Milk production was recorded daily, and milk composition (fat, protein, lactose and urea) was analysed twice a week. The physiological data were recorded once a week, before the cattle entered the holding pen and after milking, in the afternoon. Average maximum weekly temperature humidity index was 75.4 and ranged from 61.4 to 83. There were highly significant effects of cooling on physiological responses. Milk production was affected by diet and cooling, with no interaction; the highest and lowest production of milk was 22.42 and 20.07 l/cow per day, for BD+SF and CD+NSF, respectively. Protein was affected by diet, and was higher for BD (3.17 vs. 3.08%). There were interaction effects on milk fat at the 8% level, the highest concentration being 3.65% for BD+NFS. It was concluded that under grazing conditions, cooling by sprinkler and fans before milking improves the comfort of dairy cows, and that the effects on milk production and composition are enhanced when diets are specially formulated for heat-stress periods.

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“…The digestibility of forage is the highest in the vegetative stages due to variation in cell/ wall content and the stem/leaf ratio with increasing maturity (Terry and Tilley, 1964). The rate of decline in digestibility with increasing maturity also depends on annual average temperatures (Wilson et al, 1991) and on the species (Bargo et al, 2003;Gallardo et al, 2005).…”

mentioning

confidence: 99%

Nutritive value of red clover and lucerne forages for ruminants estimated by in vitro and in vivo digestibility methods

Homolka¹,

Koukolová²,

Podsedníček³

et al. 2012

CZECH J ANIM SCI

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ABSTRACT:The aim of this study was to determine the nutrient and energy levels of red clover and lucerne forage. Investigation of forage at different maturity stages of three growths was carried out by chemical analysis, in vitro and in vivo digestibility methods. Generally, maturation caused a significant increase in fibre fractions. With the increasing maturity of forage samples the in vivo, in vitro, and calculated in vivo (in vivo calcul ) digestibilities of organic matter (OM) linearly decreased. The in vitro and in vivo calcul digestibilities of OM averaged 0.754 and 0.708 for red clover and 0.717 and 0.667 for lucerne, respectively. The in vivo OM digestibility averaged 0.710 for red clover and 0.666 for lucerne. Gross energy (GE), digestible energy (DE), metabolizable energy (ME), net energy for lactation (NEL), and net energy for growth (NEG) averaged 18.12, 12.41, 9.60, 5.67, 5.50 and 18.09, 11.56, 9.01, 5.26, 4.99 MJ/kg of dry matter for red clover and lucerne, respectively. The effect of a vegetative stage on energy values of both forages was diverged for various growth times. When data were pooled across the estimated season, seven cutting-specific equations for descriptions of GE, DE, ME, NEL, NEG, in vitro, and in vivo OM digestibilities were obtained for red clover and lucerne, separately. The red clover model expression gave similar prediction equations for lucerne. It was possible to predict cutting-specific equations with coefficients of determination R 2 > 0.719 for red clover and R 2 > 0.400 for lucerne of the variation in GE, DE, ME, NEL, and NEG. The in vitro and in vivo OM digestibility equations were predicted with R 2 being 0.840 (in vitro) and 0.707 (in vivo) for red clover, and 0.979 (in vitro) and 0.937 (in vivo) for lucerne. The parameters of these specific equations were statistically preferable than the general model expression which included both forages together.

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Monensin for Lactating Dairy Cows Grazing Mixed-Alfalfa Pasture and Supplemented with Partial Mixed Ration

Cited by 37 publications

References 23 publications

Productive performance and milk protein fraction composition of dairy cows supplemented with sodium monensin

Productive performance and milk protein fraction composition of dairy cows supplemented with sodium monensin

Diet and cooling interactions on physiological responses of grazing dairy cows, milk production and composition

Nutritive value of red clover and lucerne forages for ruminants estimated by in vitro and in vivo digestibility methods

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