Resumen

CHIOSSONE, Jose L.  y  BALBUENA, O.. Efecto del nivel de suplementación con harina de algodón sobre el consumo y el aumento de peso en bovinos en recría alimentados con silaje de sorgo. RIA. Rev. investig. agropecu. [online]. 2022, vol.48, n.1, pp.84-89.  Epub 06-Abr-2022. ISSN 1669-2314.

The aim of this work to was study the effect of protein supplementation with Cottonseed meal (CSM; 351 g kg-1 PB) at levels of 0 (P0; Control), 3,0 (P1), 6,0 (P2) y 9,0 (P3) g kg-1 of live weight (LW), on total dry matter intake (DMI), silage dry matter intake (SI) average daily gain (AVG), feed conversion efficiency (FC) and blood urea nitrogen (BUN) in young beef cattle fed with sorghum silages. Twelve steers and twelve heifers averaging 8 months of age and 187 ± 12 kg, were distributed in 8 pens in a completely randomized design. Whole plant sorghum silage was made from double purpose hybrid, at late-dough stage of maturity. The experiment lasted 98 days, with 14 days for adaptation and 84 days for measurement. The variables were subjected to analysis of variance, and the three degrees of freedom from the traits were partitioned in lineal, quadratic and cubic effect contrast. DMI, AVG, FC and BUN increased (p<0,05) in a quadratic manner with supplementation level, except BUN that showed cubic effect (p<0,05). SI in kg DM an-1 .-1 was different (p<0,05) with the increase of supplementation level, but there was not different (p=0,12) expressed as g kg-1 BW, although in both cases a quadratic effect was observed (p<0,05). AVG of Control (P0) was 0,07 kg an-1 .-1, with a 18,2 g kg-1 LW of SI, that was increased 31,3% when was included 3 g kg-1 LW of CSM. The results of the assessments show that is not recommended feed young animals with sorghum silages as only feed. Supplementation with CSM had a positive effect on DMI, SI, ADG and FC, being recommended a 6 g kg-1 LW level, because a superior level showed no improvement.

Palabras clave : sorghum silage; protein supplementation; intake; weight gain; cottonseed meal; blood urea nitrogen..

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