Milk production and composition of crossbred cows supplemented with different levels of concentrate in irrigated grazing Tanzania grass pasture

Authors

  • Ricardo Dias Signoretti Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Polo Regional de Desenvolvimento Tecnológico dos Agronegócios da Alta Mogiana, Colina, SP
  • Flávio Dutra de Resende Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Polo Regional de Desenvolvimento Tecnológico dos Agronegócios da Alta Mogiana, Colina, SP
  • Bruna Pessim Fundação Educacional de Barretos, Centro Universitário, Barretos, SP
  • Fernando Henrique Meneguelo de Souza Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, SP
  • Lucas ngelo de Souza Fundação Educacional de Barretos, Centro Universitário, Barretos, SP

DOI:

https://doi.org/10.17523/bia.v70n1p10

Keywords:

body condition, irrigation, milk production, rotational stocking, supplementation

Abstract

Levels of supplementation for grazing dairy cows have been studied with the objective to determine the best relationship between amount of supplements and milk production. In this study twenty-four Gir x Holstein crossbred cows were evaluated in irrigated and fertilized Panicum maximum Jacq. cv. Tanzânia pasture, in a rotational grazing system with seven UA/ha. Cows were distributed in randomized blocks, according to the days of lactation, milk production and parity of lactation, with twelve replicates. The experiment occurred from March to October 2010, the experimental treatments were 2.5 and 5.0 kg/animal/day of concentrate supply. All animals also received 20 kg/animal/day of corn silage during season. At the end of each grazing cycle (24 days) animals were weighed and had their body condition evaluated. Milk production (MP), milk yield corrected for 3.5% of fat, protein (CP), fat (F), lactose (L), total solids (TS), nonfat dry extract, milk urea nitrogen (MUN) and somatic cell count were determined. MP in kg/day and milk adjusted to 3.5% of fat, F, CP, L, TS levels and solids, in kg and MUN (mg/dL) differed between the treatments and were higher for cows fed 5.0 kg in comparison to those received 2.5 kg of concentrate/animal/day. Production and composition of milk was greater when supplemented cows on fertilized and irrigated pasture received 5.0 kg of concentrate/day.

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Published

2013-01-11

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Milk production and composition of crossbred cows supplemented with different levels of concentrate in irrigated grazing Tanzania grass pasture. (2013). Bulletin of Animal Husbandry, 70(1), 10-19. https://doi.org/10.17523/bia.v70n1p10

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