Effect of supplemental energy source and frequency on growing calf performance1

Autor: Tim W. Loy, C. N. Macken, James C. MacDonald, Galen E. Erickson, Terry J. Klopfenstein
Rok vydání: 2008
Předmět:
Zdroj: Journal of Animal Science. 86:3504-3510
ISSN: 1525-3163
0021-8812
DOI: 10.2527/jas.2008-0924
Popis: Crossbred heifers (n = 120; 265 kg, SD = 37) were fed individually (84 d) to determine the ef- fect of supplement type, concentration, and frequency on intake and performance and to estimate the energy value of dry distillers grains plus solubles (DDGS) in a high-forage diet. Treatments were arranged in a 3 × 2 × 2 factorial, with 3 supplements, 2 concentrations, and 2 frequencies of supplementation. Supplements includ- ing dry-rolled corn (DRC), DRC with corn gluten meal (DRC + CGM), and DDGS were fed at 0.21% (LOW) or 0.81% (HIGH) of BW daily and were provided daily (DAILY) or 3 times weekly (ALT). Heifers were fed to consume grass hay (8.7% CP) ad libitum. Individual DMI, diet composition, BW, and ADG were used to calculate energy values for DDGS and DRC. Supple- ment type, concentration, frequency, and interactions were tested using the MIXED procedure of SAS, with BW included as a covariate. Supplement × concentra- tion interactions for gain (P = 0.01) and G:F (P < 0.01) were detected. At the LOW concentration, heifers supplemented with DDGS gained more and were more efficient (P ≤ 0.03) than those supplemented with DRC or DRC + CGM. No performance differences were ob- served (P ≥ 0.22) between DDGS and DRC + CGM in HIGH treatments, although both improved (P ≤ 0.01) gain and G:F relative to DRC. Calculated TDN content of DDGS was 18 to 30% greater than DRC. Gain and G:F were improved (P < 0.01) in heifers fed HIGH vs. LOW. Total intake was greater (P < 0.01) for HIGH than LOW, but LOW heifers consumed more hay (P < 0.01) than HIGH. The DAILY heifers consumed more (P < 0.01) hay and total DM than the ALT heifers. The DAILY heifers gained more (P < 0.01) than ALT, but G:F was not affected (P = 0.85) by supplementa- tion frequency. In a high-forage diet, DDGS has greater energy value than corn.
Databáze: OpenAIRE
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