The effects of active immunization against gnRH on testicular development, feedlot performance, and carcass characteristics of beef bulls.

2000 ◽  
Vol 78 (11) ◽  
pp. 2778 ◽  
Author(s):  
R B Cook ◽  
J D Popp ◽  
J P Kastelic ◽  
S Robbins ◽  
R Harland
Keyword(s):  
Carcass Characteristics ◽  
Active Immunization ◽  
Testicular Development ◽  
Feedlot Performance ◽  
Beef Bulls

RALGRO® IMPLANTS FOR INTACT MALE CALVES

1986 ◽  
Vol 66 (2) ◽  
pp. 441-449 ◽  
Author(s):  
J. E. RICHARDS ◽  
D. N. MOWAT ◽  
J. W. WILTON
Keyword(s):  
Carcass Characteristics ◽  
Morbidity Rate ◽  
Testicular Development ◽  
Live Performance ◽  
Intact Male ◽  
Feedlot Performance ◽  
Treatment Groups ◽  
Scrotal Circumference ◽  
Bull Calves ◽  
Breed Group

Forty-eight spring-born bulls (representing early-, medium- and late-maturing breed groups) and 30 fall-born bulls (representing medium- and late-maturing breed groups) were randomly assigned to either a control or treatment group within each breed group. Treated bull calves were initially implanted with Ralgro® at approximately 55 d of age and reimplanted every 84 d for a total of four implants. All bulls were weaned after 140 d on trial at an average age of 195 d, placed into a feedlot in pens of three or four within breed and treatment groups and gradually adjusted to a high grain ration. Bulls were slaughtered when they reached approximately 7 mm of backfat over the 12/13th ribs, determined ultrasonically. Weaning weights and daily gain to weaning were increased slightly, but not significantly, by implanting in both calving groups. Effects tended to be more pronounced with the earlier (medium) maturing breed groups. No effect of implanting on feedlot performance was observed in either the spring- or fall-born bulls. A reduction in the morbidity rate of the spring-born implanted bulls tended to occur during a period of disease outbreak shortly after weaning. Testicular weights were reduced (P < 0.05) with the use of implants in both calving groups. Scrotal circumference was decreased (P < 0.05) by implanting in the spring-born bulls only. For both of these traits, effects were also more pronounced in the early- and medium-maturing breed groups. Effects of implanting on carcass characteristics were slight. Key words: Ralgro®, bulls, live performance, carcass characteristics, testicular development

scholarly journals Effects of Syngenta Enogen Feed Corn containing an α-amylase trait on finishing cattle performance and carcass characteristics1

2018 ◽  
Vol 3 (1) ◽  
pp. 504-512 ◽  
Author(s):  
M L Jolly-Breithaupt ◽  
M E Harris ◽  
B L Nuttelman ◽  
D B Burken ◽  
J C MacDonald ◽  
...  
Keyword(s):  
Feed Efficiency ◽  
Carcass Characteristics ◽  
Feedlot Performance ◽  
Finishing Cattle ◽  
Main Effect ◽  
University Of Nebraska Lincoln ◽  
The University ◽  
Extension Center ◽  
Enzyme Supplement ◽  
Corn Hybrid

Abstract Two experiments evaluated the effects of feeding a new corn hybrid, containing an α-amylase enzyme trait, Syngenta Enogen Feed Corn (SYT-EFC), on feedlot performance and carcass characteristics at two locations. Experiment 1 utilized 300 calffed steers (298.5 ± 16.3 kg of BW) at the University of Nebraska–Lincoln Eastern Nebraska Research and Extension Center Mead, NE. Treatments were designed as a 2 × 2 + 1–factorial arrangement with factors consisting of 1) corn type (SYT-EFC or conventional [CON]) and 2) byproduct type (with or without Sweet Bran [SB]), or a BLEND of STY-EFC and CON without SB. In Exp. 2, 240 crossbred, calf-fed steers (287.6 ± 15.4 kg of BW) were utilized at the University of Nebraska–Lincoln Panhandle Research and Extension Center near Scottsbluff, NE. Steers were fed SYT-EFC, CON, BLEND, or CON with a commercial α-amylase enzyme supplement (CON-E). In Exp. 1, there was an interaction for ADG (P = 0.05) and G:F (P = 0.02). Steers fed SYT-EFC with SB had greater ADG and G:F than CON; however, in diets without SB, SYT-EFC and CON were not different resulting in a 10.1% change in G:F when steers were fed SYT-EFC in SB compared with CON and only 1.6% change between SYT-EFC and CON without SB. Energy values, based on performance data, resulted in a 6.5% and 8.3% change in NEm and NEg, respectively, for steers fed SYT-EFC and CON with SB and 1.6% change for both NEm and NEg for steers fed SYT-EFC and CON without SB. For the main effect of corn trait, steers fed SYT-EFC had greater marbling scores, fat depth, and calculated yield grade compared with CON (P ≤ 0.03). In diets without SB, there was no difference between SYT-EFC, CON, or BLEND for DMI, final BW, ADG, G:F, NEm, or NEg (P ≥ 0.35). In Exp. 2, cattle fed SYT-EFC, BLEND, or CON-E had greater final BW, ADG, and G:F than cattle fed CON (P ≤ 0.03). On average, NEm and NEg were 4.9% and 7.0% greater, respectively, for steers fed amylase enzyme treatments compared with CON (P ≤ 0.01). Hot carcass weights were greater in steers fed α-amylase treatments compared with CON (P &lt; 0.01). Feeding Syngenta Enogen Feed Corn, which contains an α-amylase enzyme trait, at both locations improved feed efficiency in finishing cattle diets containing WDGS or SB.

Effects of zilpaterol hydrochloride and soybean oil supplementation on feedlot performance and carcass characteristics of hair-breed ram lambs under heat stress conditions

2014 ◽  
Vol 92 (3) ◽  
pp. 1184-1192 ◽  
Author(s):  
J. L. Dávila-Ramírez ◽  
U. Macías-Cruz ◽  
N. G. Torrentera-Olivera ◽  
H. González-Ríos ◽  
S. A. Soto-Navarro ◽  
...  
Keyword(s):  
Heat Stress ◽  
Soybean Oil ◽  
Carcass Characteristics ◽  
Stress Conditions ◽  
Feedlot Performance ◽  
Zilpaterol Hydrochloride ◽  
Ram Lambs

Effect of Wagyu- versus Angus-sired calves on feedlot performance, carcass characteristics, and tenderness

2009 ◽  
Vol 87 (9) ◽  
pp. 2971-2976 ◽  
Author(s):  
A. E. Radunz ◽  
S. C. Loerch ◽  
G. D. Lowe ◽  
F. L. Fluharty ◽  
H. N. Zerby
Keyword(s):  
Carcass Characteristics ◽  
Feedlot Performance

Impact of sorting before feeding zilpaterol hydrochloride on feedlot performance and carcass characteristics of yearling steers1,2

2015 ◽  
Vol 93 (5) ◽  
pp. 2285-2296 ◽  
Author(s):  
F. H. Hilscher ◽  
E. M. Hussey ◽  
B. L. Nuttelman ◽  
D. B. Burken ◽  
W. A. Griffin ◽  
...  
Keyword(s):  
Carcass Characteristics ◽  
Feedlot Performance ◽  
Zilpaterol Hydrochloride

scholarly journals Effects of the association between whole cottonseed and calcium salts of fatty acids on nutrient intake, feedlot performance, and carcass characteristics of Bos indicus animals offered a high-concentrate diet

2021 ◽  
Author(s):  
Leonardo R. Müller ◽  
Daniel I C. G. Gouvêa ◽  
André F. Francischinelli ◽  
Guiherme D. A. Alvarenga ◽  
Pablo C Castagnino ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Soybean Oil ◽  
Feed Efficiency ◽  
Dry Matter ◽  
Bos Indicus ◽  
Carcass Characteristics ◽  
Dry Matter Intake ◽  
Feedlot Performance ◽  
Calcium Salts ◽  
Whole Cottonseed

Abstract This experiment evaluated the effects of feeding whole cottonseed (WC) and/or calcium salts of fatty acids (CSFA) on dry matter intake (DMI), performance, and carcass characteristics of Bos indicus animals receiving a high-concentrate diet during the finishing phase. On day 0, 96 Nellore bulls were blocked according to initial shrunk body weight (BW; 302 ± 26.7 kg) into group pens (4 animals/pen) and, within blocks, pens were randomly assigned to receive: 1) 15% of WC and 2% of CSFA [dry matter (DM) basis] of palm, cottonseed, and soybean oil (15WC; n = 6), 2) 10% of WC and 3% of CSFA (DM basis) of palm, cottonseed, and soybean oil (10WC; n = 6), 3) 5% of WC and 4% of CSFA (DM basis) of palm, cottonseed, and soybean oil (5WC; n = 6), and 4) 0% of WC and 5% of CSFA (DM basis) of palm, cottonseed, and soybean oil (0WC; n = 6). Diets were formulated to be isocaloric, isonitrogenous, and isolipidic. Experimental period lasted 108 days, whereas dry matter intake (DMI) was evaluated daily and blood samples and carcass measurements were obtained on days 0, 55, and 108 of the study. Upon slaughter on day 109, steaks were collected for determination of the chemical and fatty acid (FA) profile of the meat. No treatment effects (P ≥ 0.35) were observed on DMI, performance, average daily gain (ADG), carcass ultrasound measurements, and chemical variables of the steak. Nonetheless, including WC into the diets increased C12:0, C16:0, C16:1 trans-9, C17:0, C18:0, C18:1 cis-9, C18:2 cis-9,cis-12, C18:3 cis-9,cis-12,cis-15, saturated, and unsaturated FA intake (P &lt; 0.01). Moreover, adding WC increased DMI fluctuation and feed efficiency (P = 0.03), but decreased marbling (P ≤ 0.03). A treatment × day interaction was observed (P &lt; 0.01) for serum leptin concentration, as 10WC animals had greater leptin concentration on d 103 vs. other treatments (P &lt; 0.01). Regarding steak FA profile, WC addition into the diet increased C18:2 cis-7,trans-9 and C18:3 cis-9,cis-12,cis-15 (P &lt; 0.001), whereas saturated FA was quadratically affected (P = 0.02) and unsaturated FA was reduced for 15WC (P &lt; 0.04). In summary, increasing levels of CSFA into isolipidic finishing diets containing WC did not negatively impact feedlot performance, but reduced feed efficiency and increased marbling scores of Bos indicus bulls, demonstrating its feasibility as a technology to improve carcass traits of low-marbling animals.

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