Supplementation strategies for lactating F1 Holstein x Zebu cows on deferred pastures

• Autor(a) principal: Souza, Guilherme Reis de
• Data de Publicação: 2022
• Outros Autores: Rigueira, João Paulo Sampaio, Ruas, José Reinaldo Mendes, Gomes, Virgílio Mesquita, Rocha Júnior, Vicente Ribeiro, Monção, Flávio Pinto, Rufino, Leidy Darmony de Almeida, Carvalho, Cinara da Cunha Siqueira, Silva, Ariadne Freitas, Silva, Edilane Aparecida da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Semina. Ciências Agrárias (Online)
• Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/43988
• topic: Deferral of grazing; Urocloa decumbens; Crossbred cows; Milk yield; Casein.; Diferimento de pastejo; Urocloa decumbens; Vacas mestiças; Produção de leite; Caseína.

The objective of this study was to evaluate the effects of different concentrate supplementation strategies to lactating F1 Holstein x Zebu cows managed on deferred signal grass pasture on milk yield, composition and body weight gain. Thirty-six F1 Holstein x Zebu cows with average days in milk of 102 ± 10 and body weight of 501 ± 19 kg were allotted to a 4 x 5 completely randomized factorial design, with four feeding strategies and five weeks of evaluation. The treatments consisted of four nutritional strategies: deferred pasture as a source of roughage + 700 grams of protein supplement (PDPI); deferred pasture as a source of roughage + 1,200 grams of protein supplement (PDPII); deferred pasture + 15 kilograms of corn silage (natural basis) + 1,200 grams of protein supplement (PDSP) and corn silage (ad libitum) + 700 grams of protein supplement (CSS). There was no interaction (P = 0.99) between supplementation strategies and test days on milk yield and chemical composition. The mean milk yield of cows managed on PDPI, PDPII and PDSP was 11.50 kg/day (P > 0.05), which was 14.30% lower than that of cows managed on CSS. Fat content (P < 0.01), protein (P < 0.01), lactose (P < 0.01), defatted dry extract (DDE) (P< 0 .01), total solids (P < 0.01) and milk casein (P < 0.01) were affected by different supplementation strategies. F1 Holstein x Zebu cows on deferred Urochloa decumbens cv. Basilisk pasture and supplemented with concentrate maintains milk production at 11.50 kg with normal composition, maintaining satisfactory body weight and condition score.