Effects of Salinomycin on Ruminal Characteristics and Performance of Grazing Beef Steers

The objective of the present study was to evaluate the serum concentration of testosterone and the performance of beef steers submitted to different surgical or immunological castration strategies. Forty- eight Aberdeen Angus calves were randomly distributed in the following treatments: surgical castrated at birth; surgical castrated at weaning; immunocastrated with three doses of Bopriva® vaccine; immunocastrated with four doses of Bopriva® vaccine. The hormonal dosages were performed through ELISA Test by “In vitro” competition. The weighing and body condition score of the animals were determined at the beginning and at the end of each evaluated phase. The completely randomly experimental design was used. Data were submitted to variance analysis by F test, being the averages compared by Tukey test with α=0.05. There was an interaction between treatment and collection date (P<0.05) for the serum levels of testosterone. By occasion of the slaughter, all the animals presented a similar serum concentration of testosterone, characterizing them as castrated. Animals immunological castrated with three doses of Bopriva® presented higher daily average gain and total weight gain on finishing phase than the ones surgical castrated at weaning. The immunological castration shows a viable alternative in relation to surgical castration.

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Extensification of beef production - Effects of fertiliser N level on herbage yield, grazing days and performance of beef steers.

Proceedings of the British Society of Animal Production (1972) ◽

10.1017/s0308229600026945 ◽

1994 ◽

Vol 1994 ◽

pp. 149-149

Author(s):

M.G. Keane

Keyword(s):

Agricultural Policy ◽

Production Systems ◽

Stocking Density ◽

Beef Steers ◽

The European Union ◽

Beef Production ◽

N Level ◽

The Common ◽

And Performance ◽

Production Effects

Existing grassland-based male beef production systems use 200 to 300 kg N/ha and require 9 to 11 t silage plus 700 to 1200 kg concentrates per animal produced. Output is in the range 700 to 800 kg carcass per ha. Arising from the reform of the Common Agricultural Policy (CAP) of the European Union, such beef production systems must be extensified if all the animals are to qualify for the special beef premium. The reformed CAP specifies a maximum stocking density of 2 livestock units (LU) per ha whereas existing systems operate at an intensity of 2.5 to 2.7 LU per ha. The objectives of the present study were (1) to extensify beef production (from dairy bred calves) so as to obtain more production from grazed grass and less from silage and concentrates and (2) to measure the effects of reduced fertiliser N usage on herbage production, stock carrying capacity and animal performance.

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Tasco-Forage: II. Monocyte immune cell response and performance of beef steers grazing tall fescue treated with a seaweed extract.

Journal of Animal Science ◽

10.2527/2001.7941022x ◽

2001 ◽

Vol 79 (4) ◽

pp. 1022 ◽

Cited By ~ 52

Author(s):

K E Saker ◽

V G Allen ◽

J P Fontenot ◽

C P Bagley ◽

R L Ivy ◽

...

Keyword(s):

Tall Fescue ◽

Cell Response ◽

Immune Cell ◽

Seaweed Extract ◽

Beef Steers ◽

And Performance ◽

Immune Cell Response

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The Effects of rate of protein degradation in silage supplements on performance of beef cattle

Proceedings of the British Society of Animal Production (1972) ◽

10.1017/s0308229600010655 ◽

1989 ◽

Vol 1989 ◽

pp. 73-73

Author(s):

A. Belete-Adinew ◽

P.C. Garnsworthy

Keyword(s):

Beef Cattle ◽

Rumen Fermentation ◽

Beef Steers ◽

Compound A ◽

Single Protein ◽

Bean Meal ◽

Improved Performance ◽

And Performance ◽

Protein Components ◽

Soya Bean Meal

Much interest has been shown recently in synchronising the supply of nitrogen and energy yielding substrates to microorganisms in the rumen. It is argued that when supplies are synchronised, rumen fermentation will be more efficient and improved performance will result. Previous trials with beef cattle at Nottingham and elsewhere have investigated the effect of single protein sources (e.g. fishmeal, soya bean meal) on rumen fermentation and performance. However, the majority of silage-fed beef cattle in this country receive supplementary protein in compound feeds. It is possible that the digestion of the carbohydrate portion of the compound feed could compete with silage digestion for nitrogen supply. Therefore, degradation of silage should be investigated in animals actually fed on the compound feeds, rather than just considering the degradation of the protein components in a compound. A trial was carried out to investigate the influence of protein source in compound feeds on rumen fermentation and performance in beef steers given silage.

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Canola screenings as a fiber source in barley-based feedlot diets: effects on rumen fermentation and performance of steers

Canadian Journal of Animal Science ◽

10.4141/a99-065 ◽

2000 ◽

Vol 80 (1) ◽

pp. 161-168 ◽

Cited By ~ 5

Author(s):

S. J. Pylot ◽

J. J. McKinnon ◽

T. A. McAllister ◽

A. F. Mustafa ◽

J. Popp ◽

...

Keyword(s):

Control Diet ◽

Latin Square ◽

Dietary Treatment ◽

Barley Grain ◽

Feedlot Cattle ◽

Beef Steers ◽

Ruminal Fermentation ◽

Finishing Diets ◽

And Performance ◽

Barley Silage

Two experiments were conducted to determine the feeding value of canola screenings in combination with barley grain for beef steers. Four dietary treatments were used. These included canola screenings:barley grain ratios of 100:0; 75:25, 50:50, and 25:75 (as-fed basis). In a metabolic trial, the effects of dietary treatment on ruminal fermentation parameters were determined in a 4 × 4 Latin square design experiment using four ruminally fistulated steers. In a production trial, 66 individually fed steers were used in an 83-d finishing trial to determine the performance and carcass characteristics of feedlot cattle fed different levels of canola screenings. A barley grain/barley silage-based control diet was also fed for comparison purposes. Ruminal pH decreased (P < 0.05) while total volatile fatty acid concentrations increased (P < 0.05) as the level of barley grain in the diet increased. Ruminal NH3–N followed a pattern (P < 0.05) similar to that of pH. Inclusion level of canola screenings had no effect on DM intake. However, ADG and feed efficiency increased (P < 0.05) as the level of barley grain in the diet increased. Increasing the level of barley grain in the finishing diet decreased (P < 0.05) lean meat yield and increased (P < 0.05) carcass fat. It was concluded that canola screenings can be included as a source of fiber in barley-based diets. However, levels in excess of 500 g kg−1 reduced the performance of feedlot steers. Performance and cost of gain with 250 and 500 g kg−1 canola screenings in barley-based finishing diets were comparable with those fed an 800 g kg−1 barley grain and 200 g kg−1 barley silage diet. Key words: Canola screenings, ruminal fermentation, feedlot steer performance

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Effect of anhydrous ammonia treatment on the chemical composition and nutritive value of grass hay and on intake and performance in beef steers

Grass and Forage Science ◽

10.1111/j.1365-2494.1988.tb02143.x ◽

1988 ◽

Vol 43 (1) ◽

pp. 79-86 ◽

Cited By ~ 6

Author(s):

A. R. G. WYLIE ◽

R. W. J. STEEN

Keyword(s):

Chemical Composition ◽

Nutritive Value ◽

Beef Steers ◽

Ammonia Treatment ◽

Anhydrous Ammonia ◽

Grass Hay ◽

And Performance

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295 Impact of increasing levels of fumonisin on performance of finishing beef steers

Journal of Animal Science ◽

10.1093/jas/skaa054.249 ◽

2020 ◽

Vol 98 (Supplement_3) ◽

pp. 142-143

Author(s):

Jenny Jennings ◽

Steve Ensley ◽

Ty Lawrence ◽

Cathy Lockard

Keyword(s):

Treatment Period ◽

Linear Response ◽

Feedlot Cattle ◽

Experimental Unit ◽

Beef Steers ◽

Marbling Score ◽

Body Weights ◽

Effect Of Treatment ◽

And Performance ◽

The Impact

Abstract To address the gaps in current scientific knowledge, the objective of the present study was to investigate the impact of fumonisin exposure on feedlot cattle intake and performance. Fifty steers were received (d 0; 361 ± 6.4 kg), and housed individually in 1.8 x 11.0 m pens and fed once daily at 0800 h. Steers were transitioned to a dry-rolled corn-based finishing diet from d 0 to 21 and then were fed the control finishing diet until d 50. Treatment diets were formulated to achieve ≤ 5 ppm (CON), 15 (15PPM), 30 (30PPM), 60 (60PPM), and 90 ppm (90PPM) of total dietary fumonisin. Steers were fed the fumonisin treatment diets from d 50 until harvest on d 160; individual animal body weights were taken on days 0, 50, 100, 150 and 160. Animal performance and carcass data were analyzed using PROC MIXED in SAS with animal as the experimental unit and PROC GLIMMIX was used to analyze categorical carcass data. Contrasts were used to test for linear and quadratic responses. Throughout the study, there was no effect of treatment (P > 0.60), or a linear response (P > 0.16) from increasing fumonisin levels, on BW or DMI. However, CON tended to have lower ADG than the other treatments during the fumonisin treatment period (P = 0.10), and there was a positive linear response (P = 0.02) of ADG to fumonisin dose during the treatment period. Similarly, ADG tended to increase linearly over the entire feeding period (P = 0.06), as did G:F (P = 0.07). There were no differences between treatments regarding HCW, DP, marbling score, ribeye area, or YG. There were no effects of treatment on either liver abscesses (P = 0.95) or telangiectasis (P = 0.13). No differences in body weight, intake, carcass, or liver characteristics were observed in steers fed dietary levels of fumonisin ranging from 8 to 108 ppm for 110 days prior to harvest.

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