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High pasture allowance does not improve animal performance in supplemented dairy cows grazing alfalfa during autumn - winter

Por: Danelón, José Luis.
Colaborador(es): Gaggiotti, Mónica del C | Gallino, R | Palladino, Rafael Alejandro.
ISSN: 1871--141.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ALFALFA | DAIRY COWS | GRAZING | HERBAGE ALLOWANCE | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Livestock Science Vol.178 (2015), p. p.183-186, tbls.Resumen: The aim of this study was to assess the effect of three alfalfa pasture herbage allowances on milk yield and composition during autumn-winter grazing season on early autumn calving dairy cows. Eighteen multiparous Holstein dairy cows were assigned to one of three treatments in a 3 × 3 Latin square design: low herbage allowance [14 kg DM-cow; LHA], medium herbage allowance [27 kg DM-cow; MHA] and high herbage allowance [41 kg DM-cow; HHA]. Dry matter disappearance was lower at LHA although remained similar between MHA and HHA [P menor 0.05]. However, as herbage allowance [HA] increased, lower grazing efficiencies [as the proportion of material removed] were registered [P menor 0.05]. Total dry matter intake [DMI; kg-d] was also lowest for LHA and similar between the other two treatments [P menor 0.05]. Milk yield, 4 per cent FCM, milk fat [g-kg] and casein [g-kg] tended to increase from LHA to HHA [P menor 0.10]. Cows at LHA tended to loss weight whilst cows at MHA and HHA had a tendency to increase BW according the season progressed [P menor 0.10]. In summary, managing cows at HHA will allow cows to a slightly increase in individual milk production and BW gain but in detriment of herbage utilization and potentially, milk production per hectare.
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The aim of this study was to assess the effect of three alfalfa pasture herbage allowances on milk yield and composition during autumn-winter grazing season on early autumn calving dairy cows. Eighteen multiparous Holstein dairy cows were assigned to one of three treatments in a 3 × 3 Latin square design: low herbage allowance [14 kg DM-cow; LHA], medium herbage allowance [27 kg DM-cow; MHA] and high herbage allowance [41 kg DM-cow; HHA]. Dry matter disappearance was lower at LHA although remained similar between MHA and HHA [P menor 0.05]. However, as herbage allowance [HA] increased, lower grazing efficiencies [as the proportion of material removed] were registered [P menor 0.05]. Total dry matter intake [DMI; kg-d] was also lowest for LHA and similar between the other two treatments [P menor 0.05]. Milk yield, 4 per cent FCM, milk fat [g-kg] and casein [g-kg] tended to increase from LHA to HHA [P menor 0.10]. Cows at LHA tended to loss weight whilst cows at MHA and HHA had a tendency to increase BW according the season progressed [P menor 0.10]. In summary, managing cows at HHA will allow cows to a slightly increase in individual milk production and BW gain but in detriment of herbage utilization and potentially, milk production per hectare.

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