Sward allowance at early lactation of primiparous dairy cows: Ⅳ‐Body condition score and reproductive parameters
The resumption of ovarian cyclicity after parturition is closely related to the negative energy balance in this period ; the time to the beginning of the recovery of the energy balance is positively correlated with the time to first ovulation (Butler et al.1981).The reinitiation of ovarian cyclicity was delayed in primiparous cows and this was consistent with longer intervals from parturition to first service and to conception in these animals ( Meikle et al.2004 ).Grazing first calving cows have a decreased reproductive efficiency, since they recover from the negative energy balance period with more difficulty than multiparous cows.Dry matter intake (DMI) is a main factor affecting energy balance and thus, anoestrus length.DMI under grazing is largely determined by sward state (Chilibroste et al.,2005).In this study the effect of daily sward allowance on the evolution of body condition score (BCS), postpartum anestrus length and on the diameter of the dominant follicle (DF) was investigated in primiparous cows under grazing conditions.
early lactation primparous dairy cows anestrus body conditions score
Adrien M.L.; Meikle A.; Soca P.Mattiauda D.A.and Chilibroste
EEMA C,Facultad de Agronomía,Ruta 3 km 363,CP 60000,Paysandú,Uruguay. Laboratorio de TécnicasNucleares,Facultad de Veterinaria
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）