Effects of short-term feed restriction on the physiological parameters and metabolites of F1 Holstein x Zebu cows in different stages of lactation

• Autor(a) principal: Borges,L.A.
• Data de Publicação: 2020
• Outros Autores: Ruas,J.R.M., Rocha Júnior,V.R., Carvalho,C.C.S., Monção,F.P., Gomes,V.M., Rigueira,J.P.S., Pinheiro,P.G.M., Sales,E.C.J., Rufino,L.D.A., Silva,E.A., Queiroz,D.S., Ferreira,H.C.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Arquivo brasileiro de medicina veterinária e zootecnia (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352020000401545
• topic: cholesterol; respiratory rate; glucose; NEFA

ABSTRACT This study aimed to evaluate the effects of different nutritional plans on the productive, physiological and metabolic parameters of F1 ½ Holstein x ½ Zebu cows in different stages of lactation. Sixty lactating cows were allotted to a completely randomized 5 x 3 factorial design with five feed allowances and three lactation periods. The dry matter intake, milk yield and heart rate were reduced by 5.69kg, 2.41kg and 10.36 beats/min (morning) and 10.25 beats/min (afternoon) for each 1% feed restriction, respectively. There was no difference in the concentration of glucose, total protein, albumin, cholesterol and non-esterified fatty acids for cows subjected to different feed allowances, with means of 95.25, 7.98, 2.95, 121.68 and 0.45mg/dL, respectively. Feed restriction of up to 2.50% BW is a cost reduction strategy that does not alter milk yield, regardless of the stage of lactation.