Performance of beef cattle grazing oats supplemented with energy, escape protein or high quality hay

The objective was to evaluate the effect of supplementing with energy and energy–escape protein concentrates or hay, on animal productivity, rumen and blood parameters of cattle grazing oats pasture (OP). Two experiments (Exp 1 and Exp 2) were conducted in two consecutive years, with Aberdeen Angus...

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Bibliographic Details
Published in:Animal feed science and technology 2003-03, Vol.105 (1), p.29-42
Main Authors: Arelovich, H.M, Arzadún, M.J, Laborde, H.E, Vasquez, M.G
Format: Article
Language:English
Subjects:
alfalfa hay
Angus
Animal productions
average daily gain
beef cattle
Biological and medical sciences
blood
blood composition
calcium
Cattle
corn
corn gluten meal
crude protein
energy
forage
Fundamental and applied biological sciences. Psychology
grazing
heifers
magnesium
mineral content
oats
Oats pasture
pastures
Plasma minerals
protein concentrates
protein supplements
rumen
rumen fermentation
Rumen parameters
sodium
Supplementation
Terrestrial animal productions
Vertebrates
Weight gain
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Summary:The objective was to evaluate the effect of supplementing with energy and energy–escape protein concentrates or hay, on animal productivity, rumen and blood parameters of cattle grazing oats pasture (OP). Two experiments (Exp 1 and Exp 2) were conducted in two consecutive years, with Aberdeen Angus heifers grazing continuously OP. In Exp 1, 24 heifers (204 kg initial-weight) were grazing 55 days. The treatments were: unsupplemented control (CON1), or 2 kg per animal per day of ground corn (CORN1), or 75% ground corn + 25% corn gluten meal (C-GM). In Exp 1 herbage mass of OP decreased from 1777 to 1209 kg dry matter (DM)/ha from July to September. The DM concentration averaged 296 g/kg of fresh OP, and crude protein (CP) was below 100 g/kg DM; initially NPN was 47% of CP, decreasing later. Ca increased with time from 3.5 to 6.0 g/kg DM, the other minerals were not affected by date. The ratio K/(Ca+Mg) was high on July (3.80 meq/kg DM) and decreased in August to September (2.73 and 1.94, respectively). Average daily gain (ADG) averaged 921 g per day for C-GM versus 670, 759 for CON and CORN1, respectively. A non-significant decrease in rumen pH was detected for CORN1 (mean of 6.26). Rumen NH 3-N was not affected by treatment, being the highest value 4.44 mg/dl in September ( P
ISSN:0377-8401
1873-2216
DOI:10.1016/S0377-8401(03)00045-2