3 results on '"Vanderhoff, Sydney T."'
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2. Daily Versus Three Times a Week Ddgs Supplementation on Grazing Calves.
- Author
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Vanderhoff, Sydney T., Sjostrand, Rebecca L., MacDonald, Jim C., Drewnoski, Mary E., and Norman, Mitchell M.
- Subjects
- *
GRAZING , *FEEDLOTS , *DIETARY supplements , *CALVES , *ANIMAL health , *FORAGE plants , *BLOCK designs - Abstract
Supplemental feed may be provided to cattle in grazing systems to increase ADG, but can be labor intensive. This study evaluated the performance of steers grazing smooth bromegrass pastures supplemented dried distillers grains plus solubles (DDGS) either daily or three times per week. Crossbred steers (n = 144, initial BW 317 ± 1.25 kg) were used in a randomized complete block design with 3 treatments allocated randomly to 24 paddocks in one of 6 blocks. Treatments consisted of: 1) steers supplemented daily with 0.8% of BW (DM-basis) of DDGS, 2) steers supplemented three times a week with 1.86% of BW (DM-basis) of DDGS, and 3) steers that received no supplementation (control). All steers were implanted with 40 mg trenbolone acetate and 8 mg estradiol (Rev-G; Merck Animal Health, De Soto, KS) implants. Paddocks were divided equally into three strips and rotationally grazed. Put-and-take steers were utilized to match stocking rate with forage growth. Each treatment group rotated through three 0.81-hectare strips per pasture. Pre-graze and post-graze biomass was measured at ground level from each paddock at each rotation. Pre-graze biomass samples were used to determine forage availability. Grazing was initiated in early May with cattle removed from pastures in August, for a total of 97 grazing days. Data were analyzed with MIXED procedure of SAS with paddock as experimental unit and treatment and block as fixed effects. Treatment means of ADG and ending BW differed (P < 0.01) among treatments. The control calves gained 0.85 kg/d. The supplemented treatments significantly increased (P < 0.01) ADG compared with the control, with daily supplementation gaining 1.25 kg/d and 3x gaining 1.11 kg/d. The ADG was decreased (P < 0.01) with 3x a week compared with daily supplementation. The differences in ADG resulted in similar differences in final live BW. The control had a finial live BW of 398 kg and final live BW of both supplemented treatments was significantly increased (P < 0.01) when compared with the control treatment. Final live BW of 3x supplemented steers (423 kg) was decreased (P < 0.01) when compared with daily supplemented steers (436 kg). For steers grazing smooth bromegrass pastures, daily supplementation of DDGS resulted in greater gains and therefore greater final BW when compared with three times a week supplementation and the non-supplemented control. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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3. Interaction of Backgrounding System and Implant Use on Growing Calf Performance and Daily Versus Three Times a Week DDGS Supplementation on Grazing Calves
- Author
-
Vanderhoff, Sydney T
- Subjects
- Backgrounding, compensatory gain, grazing, supplementation, Animal Sciences, Beef Science
- Abstract
A backgrounding experiment (Exp 1) was conducted over two years to determine the interactions of winter rate of gain at a high gain (HIGH) of 0.91 kg and low gain (LOW) 0.45 kg, and implant strategy in the winter and summer phases and subsequent effects in the finishing phases. The first factorial was a 2C2C2 with factor one being high or low gain during the winter period, factor two implant or no implant during the winter, and factor three implant or no implant during the summer phase. The second factorial was also a 2C2C2 utilizing pen-fed steers to achieve similar ADG as the HIGH and LOW steers grazing corn residue. The first factor is a rate of gain at either HIGH or LOW. The second factor was implant strategy in the summer phase receiving an implant or no implant. Steers were penned in experimental units during the summer phase and fed a forage-based diet. In the finishing phase, all steers were placed on a common finishing program. In the winter phase, HIGH and LOW steers gained 0.95 and 0.53 kg/d (P < 0.01). Steers on the HIGH treatment housed on corn residue had greater ADG than those housed in pens, 0.95 and 0.88 kg/d respectively. In the summer, LOW steers gained 0.95 kg/d vs. 0.84 kg/d for HIGH steers (P < 0.01). At the conclusion of finishing, HIGH resulted in 45 kg more final BW than LOW steers (P < 0.01) while the Rev-IS implant during the summer phase resulted in 38 kg of additional final BW over non-implanted steers (P < 0.01). Supplementing at a high rate of gain during the winter backgrounding phase and implanting in the winter and summer results in the greatest total system gain and HCW. A grazing experiment (Exp 2) was conducted to evaluate the performance of steers grazing smooth bromegrass pastures supplemented dried distillers grains plus solubles (DDGS) either daily or three times per week. Treatments consisted of 1) steers supplemented DDGS daily 2) steers supplemented DDGS three times a week and 3) steers that received no supplementation (control). The control calves gained 0.85 kg/d. The supplemented treatments significantly increased (P < 0.01) ADG compared to the control, with daily supplementation gaining 1.25 kg/d and 3x gaining 1.11 kg/d. Ending BW and ADG was decreased (P < 0.01) with 3x a week compared to daily supplementation. For steers grazing smooth bromegrass pastures, daily supplementation of DDGS resulted in greater gains and ending BW when compared to three times a week supplementation, which were both greater than not supplementing. Advisor: James MacDonald
- Published
- 2023
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