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Arquivo Brasileiro de Medicina Veterinária e Zootecnia

Print version ISSN 0102-0935

Abstract

TEIXEIRA, A.M. et al. Performance of crossbred Holstein x Zebu cows rotationally grazing in Tifton 85 pasture irrigated or rainfed. Arq. Bras. Med. Vet. Zootec. [online]. 2013, vol.65, n.5, pp.1447-1453. ISSN 0102-0935.  https://doi.org/10.1590/S0102-09352013000500025.

The aim of this study was to determine the stocking rates and milk production of crossbred Holstein x Zebu cows managed under irrigated or rainfed Tifton 85 pastures in Uberaba- MG. The statistical design adopted was completely randomized blocks with three repetitions per treatment, in a 2 x 10 factorial arrangement (2 treatments and 10 seasons). The average was compared using the Scott-Knott test with 5% probability (P<0.05). To evaluate animal performance, 11 lactating cows per treatment were used. The pasture was managed in a rotational grazing system with 21 and 35 days of grazing interval and 3 and 5 days of grazing in each paddock, in the rainy and dry seasons respectively. The stocking rate of the irrigated system was 4.6 UA.ha-1 and was superior (p<0.05) to the stocking rate of the rainfed system that was 2.2 UA.ha-1. There were no differences among the systems (p>0.05) for the average daily milk yield of the cows. In the irrigated system the average milk yield was 51.7 liters.ha-1.dia-1. With irrigation, a considerable intensification of the system was possible because it provided a superior stocking rate capacity compared to the rainfed system.

Keywords : Cynodon; grazing management; irrigation; yield.

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