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Effects Of Cryptosporidiosis On Feed Utilization By Yearling Steers, L. A. Goss, J. U. Thomson, R. H. Pritchard
Effects Of Cryptosporidiosis On Feed Utilization By Yearling Steers, L. A. Goss, J. U. Thomson, R. H. Pritchard
South Dakota Beef Report, 1991
Four 18-month-old Angus steers were used to study the effects of chronic cryptosporidiosis on feed utilization. Two of the steers tested positive for shedding Cryptosporidium and two noninfected steers were used as controls. The steers were offered a high concentrate diet. Digestibilities of dry matter (85.66 vs 80.33 ± 3.49%), crude protein (80.12 vs 73.47 ± 5.18%), ADF (72.88 vs 70.92 ± 2.32%) and NDF (86.28 vs 84.40 ± 1.99%) were similar for control and Cryptosporidium infected steers, respectively. The mean abomasal chyme pH was 4.72 ± .016. Abomasal weight was 3.72 Ib for the control steers and 6.50 Ib …
Combinations Of Synovex¹ And Finaplix² For Yearling Steers, J. J. Wagner, R. H. Pritchard
Combinations Of Synovex¹ And Finaplix² For Yearling Steers, J. J. Wagner, R. H. Pritchard
South Dakota Beef Report, 1991
Ninety crossbred yearling steers (818 ± 19 Ib) were utilized to evaluate the influence of implant treatment and days on feed on carcass characteristics and feedlot average daily gain (ADG). Treatments included no implant (C), implanted with Synovex-S on day 1 and Synovex-S on day 60 (SS) and implanted with Synovex-S on day 1 and with Synovex-S and Finaplix-S on day 60 (SSF). Ten steers from each treatment were slaughtered after 120, 134 or 148 days on feed. Implanting increased (P< .0001) ADG 18.9% and hot carcass weight (HCW) 6.4%. However, interactions between treatment and days on feed were significant (P<.05) for ADG and HCW. No other interactions were apparent. Rib eye area (REA) was 4.7% greater (P<.05) for implanted steers as compared to nonimplanted controls (13.72 vs 13.11 in.2). ADG (P<.12), HCW (P<.10) and REA (P<.05) were greater for steers implanted with SSF as compared to steers implanted with SS (3.90 vs 3.75 Ib, 846 vs 831 Ib, and 14.06 vs 13.38 in. , respectively). Marbling score (5.00 = Small°) tended (P<.16) to be lower for implanted steers compared with nonimplanted controls (5.54 vs 5.77 units). Marbling score was slightly (P<.16) lower for cattle implanted with SSF as compared to cattle implanted with SS (5.40 vs 5.67). Predicted days required to reach 75% low choice were 113, 124 and 138 for C, SS and SSF, respectively.
Implant Strategies For Yearling Steers, R. H. Pritchard, M. A. Robbins
Implant Strategies For Yearling Steers, R. H. Pritchard, M. A. Robbins
South Dakota Beef Report, 1991
Various implant strategies were compared in heavy yearling steers fed for 98 days. Implant treatments included control (nonimplanted), 722 (72 mg zeranol), 36TBA (36 mg zeranol plus 140 mg trenbolone acetate [TBA]), 72TBA (72 mg zeranol plus TBA) and ETBA (20 mg estradiol-200 mg progesterone plus TBA). The 72-mg zeranol dosage represents two implants in one site. Combinations of implants were administered, one in each ear. Implanting increased (P<.05) ADG and DM1 and decreased (P<.05) feed/gain values. Among implanted steers, no differences (P>.10) in ADG or DM1 were observed. Feed/gain was lower (P< .05) for zeranol-TBA combinations than the 72-mg zeranol treatment. Carcasses were heavier and rib eye area was greater (P<.05) in the 72TBA than 36TBA treatment. Kidney-pelvic-heart fat was lower (P<.05) when the ETBA combination was used.
Grain Sources And Roughage Levels For Limited Feeding Backgrounding Programs, R. H. Pritchard, M. A. Robbins
Grain Sources And Roughage Levels For Limited Feeding Backgrounding Programs, R. H. Pritchard, M. A. Robbins
South Dakota Beef Report, 1991
The effects of grain source and roughage level in limited intake feeding programs were evaluated in 622-lb steer calves. Supplemented diets were based on high moisture ear corn (HMEC), whole shelled corn (WSC) + hay to provide similar NDF to the HMEC diet, HMEC diet containing 10% hay and the WSC + hay diet formulated to contain NDF similar to HMEC + hay. Steer calves were blocked by weight and fed to achieve 2.2 Ib ADG for a 52-day period. Steers fed HMEC had higher (P<.01) ADG and lower (P<.01) feed/gain than WSC fed steers. Low crude protein in the hay source caused lower (P<.01) crude protein in WSC diets. Lower crude protein intake could have limited steer growth. NE utilization appeared more efficient (P<.05) for heavy weight block steers, reflecting NRC equation low sensitivity to modest differences in frame size. Roughage level did not affect performance and did not interact with grain source.