Sward allowance at early lactation of primiparous dairy cows: Ⅲ‐Metabolic profiles
Major adaptive changes occur during the transition period (3 weeks before and after calving) to cope with the high energy demands of lactation.This transition from pregnant nonlactating state to the nonpregnant lactating state represents a dramatic change for the cow, as nutrients requirements exceed dietary intake potential, and thus, a state of negative energy balance is established to provide additional substrate for milk production.First calving cows recover from the negative energy balance period with more difficulty than multiparous cows (Meikle et al.2004) and this factor is usually more dramatic under grazing conditions.Dry matter intake (DMI) is a main factor affecting energy balance, and sward state largely affects DMI under grazing (Chilibroste et al.,2005).The metabolic variations that occur during the peripartum period can be monitored by the concentration of some metabolites in blood.In this study the effect of daily sward allowance on metabolic profiles and its relation with milk production and evolution of body condition score (BCS) was investigated in primiparous cows under grazing conditions.
early lactation primparous dairy cows metabolic profiles
Meikle A.; Mattiauda D.A.; Uriarte G.; Adrien L,Soca P.and Chilibroste
Laboratorio de TécnicasNucleares,Facultad de Veterinaria. EEMA C,Facultad de Agronomía,Ruta 3 km 363,CP 60000,Paysandú DiLaVe,Ministerio Ganaderia Yagricultura,Uruguay
国际会议
呼和浩特
英文
2008-06-29（万方平台首次上网日期，不代表论文的发表时间）