Suplementação com óleo de girassol em dietas de vacas em lactação: parâmetros zootécnicos
DOI:
https://doi.org/10.5433/1679-0359.2024v44n2p329Palavras-chave:
Perfil metabólico sanguíneo, Digestibilidade, Helianthus annus, Dieta rica em gordura, Consumo.Resumo
Oito vacas Jersey (2ª-4ª lactação; peso corporal 443 ± 63 kg; produção de leite, 21±2.2 kg dia/dia) foram utilizadas em delineamento duplo quadrado latino 4x4 para avaliar se a inclusão de níveis crescentes de óleo de girassol no concentrado até o limite de 110.0 g kg-1 DM of EE, em substituição ao milho, tem impacto sobre a produção e composição do leite, eficiência alimentar, balanço energético, consumo e digestibilidade das dietas, e o perfil de ácidos graxos da gordura do leite de vacas da raça Jersey. Para a dieta controle não houve inclusão de óleo de girassol, com concentração de extrato etéreo (EE) de 37.6 g kg-1 MS entre a mistura de concentrado e volumoso, os demais tratamentos consistiram na inclusão de níveis crescentes de óleo de girassol nas concentrações 65.3; 85.6 ou 110.0 g kg-1 de EE na MS. O aumento do EE nas dietas não afetou o consumo de matéria seca, fibra em detergente neutro ou proteína bruta. Houve aumento linear nos coeficientes de digestibilidade para matéria orgânica, proteína bruta, EE, fibra em detergente neutro e níveis sanguíneos de colesterol. Os tratamentos não afetaram a produção de leite, teor de gordura, lactose ou sólidos totais. É possível utilizar até o limite de 110.0 g kg-1 de EE na dieta em substituição ao grão de milho, diminuindo a quantidade de concentrado ingerido.
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