scholarly journals Effect of silage source, physically effective neutral detergent fiber, and undigested neutral detergent fiber concentrations on performance and carcass characteristics of finishing steers

2021 ◽  
Author(s):  
M C S Pereira ◽  
W Z Yang ◽  
K A Beauchemin ◽  
T A McAllister ◽  
K M Wood ◽  
...  
Keyword(s):  
Carcass Characteristics ◽  
Neutral Detergent Fiber ◽  
Marbling Score ◽  
Liver Abscesses ◽  
Finishing Steers ◽  
Quality Grade ◽  
Fat Thickness ◽  
Dressing Percentage ◽  
Grade 3 ◽  
Barley Silage

Abstract This study was designed to evaluate the effect of silage source (barley vs. wheat silage) when harvested at two chop lengths (low vs. high physically effective NDF [peNDF]) and when barley silage was partially replaced with straw to increase the undigested neutral detergent fiber (uNDF) concentration on performance and carcass characteristics of finishing steers. Four hundred and fifty yearling commercial crossbred steers with an initial body weight (BW) of 432 ± 30.5 kg were allocated to 30 pens and fed diets containing 90% concentrate:10% forage for 123 days in a completely randomized block design with a 2×2 + 1 factorial arrangement. Treatments included: 1) barley silage (BarS) with low peNDF (LpeNDF); 2) BarS with high peNDF (HpeNDF); 3) BarS with straw to yield a diet with LpeNDF + uNDF; 4) wheat silage (WhS) LpeNDF; and 5) WhS HpeNDF. There were no silage x peNDF interactions for dry matter intake (DMI), average daily gain (ADG), or gain to feed ratio (G:F), but cattle fed WhS LpeNDF had a lower (P < 0.01) proportion of yield grade 3 and a greater proportion in yield grade 2 carcasses than cattle fed BarS LpeNDF or HpeNDF and WhS HpeNDF. Cattle fed WhS LpeNDF had greater (P = 0.02) incidence of severe liver abscesses when compared to cattle fed BarS LpeNDF or HpeNDF and WhS HpeNDF. Cattle fed BarS consumed less (P < 0.01) uNDF as a percentage of BW, had increased (P = 0.02) ADG, heavier (P = 0.02) hot carcass weight, with greater (P = 0.01) back fat thickness, and (P < 0.01) incidence of minor liver abscesses when compared to cattle fed WhS. Feeding HpeNDF did not affect DMI, ADG, or G:F, but increased (P = 0.02) marbling score, and reduced (P < 0.01) the proportion AA quality grade and increased (P < 0.01) those classified as AAA as compared to cattle fed LpeNDF. Cattle fed low uNDF had lesser (P < 0.01) uNDF intake as a percentage of BW, greater dressing percentage (P = 0.01), had a lower (P < 0.01) proportion of carcasses in yield grade 2, and a greater (P < 0.01) proportion of carcasses in yield grade 3 when compared to cattle fed high uNDF. Thus, silage source, peNDF, and uNDF content do not impact DMI or G:F when diets contain 10% forage, but BarS relative to WhS as well increasing the peNDF concentration may increase ADG, HCW, back fat thickness, dressing percentage, marbling score and carcasses classified as quality grade AAA. Future research is needed to evaluate the usefulness of peNDF and uNDF in rations for finishing cattle.

scholarly journals Effect of metabolizable protein intake on growth performance, carcass characteristics, and feeding behavior in finishing steers

2019 ◽  
Vol 3 (4) ◽  
pp. 1173-1181
Author(s):  
Leonardo G Sitorski ◽  
Marc L Bauer ◽  
Kendall C Swanson
Keyword(s):  
Feeding Behavior ◽  
Growth Performance ◽  
Carcass Characteristics ◽  
Feed Ratio ◽  
Marbling Score ◽  
Quadratic Effect ◽  
Metabolizable Protein ◽  
Finishing Steers ◽  
Fat Thickness ◽  
Time Eating

Abstract One-hundred thirty-two finishing steers (300 ± 2.7 kg body weight [BW]) predominately of Angus, Simmental, and Shorthorn breeding were used to study the effect of metabolizable protein (MP) intake on growth performance, carcass characteristics, and feeding behavior. Steers were stratified by initial BW across five pens and randomly assigned to one of four dietary treatments to supply an average of 626, 906, 1,209, and 1,444 g MP/d (n = 33 per treatment). Feed intake and feeding behavior were measured using radio frequency identification tags and the Insentec feeding system. For feeding behavior, a visit was defined as each time the Insentec system detected a steer at the feed bunk. A meal was defined as eating periods by intervals no longer than 7 min. Steers were fed until they reached an average BW of 598 ± 3.1 kg. Average daily gain (ADG) responded quadratically (P < 0.01) with ADG increasing in steers fed 906 g MP/d and plateauing thereafter. Dry-matter intake (DMI; kg) responded quadratically (P = 0.009) with DMI increasing with MP intake up to 1,209 g/d MP and decreasing thereafter. Gain to feed ratio (G:F) increased linearly (P = 0.04) and tended (P = 0.10) to respond quadratically, as G:F increased up to 906 g MP/d and plateaued thereafter. A quadratic response (P = 0.04 and P = 0.02, respectively) was observed for marbling score and 12th rib subcutaneous fat thickness with steers fed 1,209 g MP/d having the greatest marbling score and back fat thickness. A quadratic effect for visits and meals per day was observed (P < 0.01) with steers fed the 1,209 g MP/d treatment having the least visits and meals per day. In addition, time eating per visit responded quadratically (P = 0.05) with time increasing from 626 to 906 g MP/d. There was a linear increase (P ≤ 0.02) in time eating per meal and per day with increasing MP intake. A quadratic effect (P < 0.03) was observed for DMI per visit, meal, and minute with steers fed 1,209 g MP/d having the greatest DMI. In summary, steers fed 626 g MP/d had increased visits and meals per day. However, DMI per visit, meal, and minute were greater in steers fed 1,209 g MP/d. A day × treatment interaction (P < 0.001) was observed for plasma urea N as concentrations increased to a greater extent over time in the higher MP treatments than in the lower MP treatments. These data indicate that MP supply (from deficient to excess) influences growth performance, carcass characteristics, and feeding behavior of finishing steers.

273 Effect of Feedlot Implant Dose and Terminal Window Timing on Heifer Performance and Carcass Characteristics

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 131-131
Author(s):  
Nathan Pyatt ◽  
Gary Vogel ◽  
Mike Brown ◽  
Frank White ◽  
William Kayser ◽  
...  
Keyword(s):  
Mixed Model ◽  
Random Effect ◽  
Carcass Characteristics ◽  
Live Performance ◽  
Marbling Score ◽  
Trenbolone Acetate ◽  
Quality Grade ◽  
Final Weight ◽  
Fat Thickness ◽  
Main Effects

Abstract Feedlot heifers (n = 3,778; initial BW = 310 kg; SD = 28 kg) were utilized in a 3 x 2 factorial arrangement (9 pens/treatment) to investigate increasing implant dose and terminal window (TW) timing on growth and carcass merit. Component with Tylan® implant dose treatments were 1. Initial TE-IH [80 mg trenbolone acetate (TBA), 8 mg estradiol (E2)] and terminal TE-H (140 mg TBA, 14 mg E2; IH/H), 2. Initial TE-IH and terminal TE-200 (200 mg TBA, 20 mg E2; IH/200), or 3. Initial TE-200 and terminal TE-200 (200/200). Heifers were fed 171 d with terminal implant administered 100 or 60 d prior to slaughter; initial implant window was inverse (71 or 111 d) to TW. Data were analyzed as a mixed model with block included as a random effect. No significant dose x TW interactions occurred for growth or carcass characteristics (P ≥ 0.06) therefore, main effects are presented. Terminal window treatments resulted in similar (P > 0.25) live performance. Heifers reimplanted 60 d prior to slaughter had improved (P < 0.05) marbling score and lower YG2 carcasses. Final weight, gain, HCW, yield, and LM area increased (linear; P < 0.05), while marbling score and fat thickness decreased (linear; P < 0.05) with increasing heifer implant dose. Heifers implanted with IH/200 had lower (P < 0.05) DMI compared to IH/H. IH/200 and 200/200 had improved (+2.1%; P < 0.05) efficiency compared to IH/H. HCW for 200/200 was +3.2 and 5.5 kg greater than IH/200 and IH/H, respectively. 200/200 were leaner with +7.4% YG 1&2 and -5.4% YG 4&5, but -8.5% Prime & Choice carcass compared to IH/H. Shortening TW from 100 to 60 d prior to slaughter did not alter growth performance. Increased implant dose in heifers improved gain, efficiency, HCW and yield with some quality grade considerations.

scholarly journals Use of barley or corn silage when fed with barley, corn, or a blend of barley and corn on growth performance, nutrient utilization, and carcass characteristics of finishing beef cattle

2019 ◽  
Vol 4 (1) ◽  
pp. 129-140 ◽  
Author(s):  
Jordan A Johnson ◽  
Brittney D Sutherland ◽  
John J McKinnon ◽  
Tim A McAllister ◽  
Gregory B Penner
Keyword(s):  
Body Weight ◽  
Beef Cattle ◽  
Growth Performance ◽  
Carcass Characteristics ◽  
Corn Silage ◽  
Neutral Detergent Fiber ◽  
Feed Ratio ◽  
Final Body Weight ◽  
Liver Abscesses ◽  
Finishing Beef Cattle

Abstract The objective of this study was to evaluate the effects of the source of silage, cereal grain, and their interaction on growth performance, digestibility, and carcass characteristics of finishing beef cattle. Using a completely randomized design within an 89-d finishing study, 288 steers were randomly assigned to 1 of 24 pens (12 steers/pen) with average steer body weight (BW) within a pen of 464 kg ± 1.7 kg (mean ± SD). Diets were arranged in a 2 × 3 factorial with corn silage (CS) or barley silage (BS) included at 8% (dry matter [DM] basis). Within each silage source, diets contained dry-rolled barley grain (BG; 86% of DM), dry-rolled corn grain (CG; 85% of DM), or an equal blend of BG and CG (BCG; 85% of DM). Total tract digestibility of nutrients was estimated from fecal samples using near-infrared spectroscopy. Data were analyzed with pen as the experimental unit using the Mixed Model of SAS with the fixed effects of silage, grain, and the two-way interaction. Carcass and fecal kernel data were analyzed using GLIMMIX utilizing the same model. There were no interactions detected between silage and grain source. Feeding CG increased (P < 0.01) DM intake by 0.8 and 0.6 kg/d relative to BG and BCG, respectively. Gain-to-feed ratio was greater (P = 0.04) for BG (0.172 kg/kg) than CG (0.162 kg/kg) but did not differ from BCG (0.165 kg/kg). Furthermore, average daily gain (2.07 kg/d) and final body weight did not differ among treatments (P ≥ 0.25). Hot carcass weight (HCW) was 6.2 kg greater (372.2 vs. 366.0 kg; P < 0.01) and dressing percentage was 0.57 percentage units greater (59.53 vs. 58.96 %; P = 0.04) for steers fed CS than BS, respectively. There was no effect of dietary treatment on the severity of liver abscesses (P ≥ 0.20) with 72.0% of carcasses having clear livers, 24.4% with minor liver abscesses, and 3.6% with severe liver abscesses. Digestibility of DM, organic matter, crude protein, neutral detergent fiber, and starch were greater for BG (P < 0.01) than CG or BCG. As expected, grain source affected the appearance of grain kernels in the feces (P ≤ 0.04). Feeding CS silage increased the appearance of fractured corn kernels (P = 0.04), while feeding BS increased fiber appearance in the feces (P = 0.02). Current results indicate that when dry rolled, feeding BG resulted in improved performance and digestibility compared with CG and BCG. Even at low inclusion levels (8% of DM), CS resulted in improved carcass characteristics relative to BS.

Carcass characteristics and tissue-mineral contents of steers fed supplemental chromium

1992 ◽  
Vol 72 (3) ◽  
pp. 663-669 ◽  
Author(s):  
X. Chang ◽  
D. N. Mowat ◽  
G. A. Spiers
Keyword(s):  
Average Daily Gain ◽  
Carcass Characteristics ◽  
Liver Weight ◽  
Carcass Composition ◽  
Marbling Score ◽  
Mineral Contents ◽  
Tissue Samples ◽  
Growing Period ◽  
Finishing Steers ◽  
Kidney Fat

This study investigated the effects of supplemental chromium (Cr) (0 or 0.2 mg kg−1 from high-Cr yeast) on performance, carcass characteristics and tissue-mineral contents of growing–finishing steers fed corn silage supplemented with either urea–corn or soybean meal during the growing period and a high-grain diet during the finishing period. Ninety-six Charolais-crossed steers, divided into four treatment groups with 24 animals each, were fed for a 70-d growing period followed by a 68-d finishing period. After continuous supplemental Cr, steers were commercially slaughtered and their carcass characteristics were evaluated. Tissue samples, including loin-eye lean and rib fat, liver and kidney, were analyzed for Cr and other minerals (P, Ca, Mg, Fe, Zn and Cu). Supplemental Cr had no effects (P > 0.05) on average daily gain (ADG), dry-matter intake, (DMI), feed efficiency (ADG/DMI), and carcass characteristics, including dressing percentage, loin-eye area, backfat thickness, marbling score, kidney fat and liver weight. Proportion of lean, fat and bone in rib sections was not affected (P > 0.05) by Cr supplementation. Supplemental Cr also did not affect (P > 0.05) total-tissue Cr and other mineral concentrations. However, supplemental Cr increased (P < 0.05) the Cu level of livers in steers fed urea–corn supplements during the growing period. This study showed that continuous supplementation of Cr (0.2 mg kg−1) to unstressed growing-finishing steers had no effect on carcass composition and several minerals in various tissues. Key words: Chromium, steer, carcass, tissue

scholarly journals Carcass characteristics of immunocastrated steers finished on diets with different energy patterns

2021 ◽  
Vol 51 (1) ◽  
Author(s):  
A.F. De Moura ◽  
D.C.A. Filho ◽  
I.L. Brondani ◽  
L.B. Pereira ◽  
G. Joner ◽  
...  
Keyword(s):  
Energy Levels ◽  
Subcutaneous Fat ◽  
Carcass Characteristics ◽  
Dietary Energy ◽  
Marbling Score ◽  
Randomized Design ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
Completely Randomized Design ◽  
Dietary Treatments

The aim of this study was to evaluate the effects of various dietary energy levels on the carcass and meat characteristics of feedlot-finished steers. A total of 27 purebred and crossbred Charolais and Nellore steers were used, with a mean initial age of 22 months and weight of 253 kg. The animals were allotted to a completely randomized design with three treatments and nine replicates each. Dietary treatments were arranged so that the average forage to concentrate ratio (FCR) was equivalent to that of a constant FCR treatment. The treatments consisted of CT (constant FCR at 60 to 40), CT5 (starting with 70: 30 FCR and finishing with 50: 50 FCR, that is, a mean overall FCR of 60: 40), and CT10 (starting with 80: 20 FCR and finishing with 40: 60, that is, a mean overall FCR of 60: 40). The dietary treatments did not affect slaughter weight, carcass weight, carcass conformation, physiological maturity, subcutaneous fat thickness, ribeye area, marbling score, and carcass measurements or the yield of commercial cuts. Chilling loss was higher in CT10 steers (2.41%) than in CT (2.26%) and CT5 (2.15%).

scholarly journals PSI-4 Effect of rumen protected capsaicin on dry matter intake, average daily gain, and carcass characteristics in finishing beef cattle

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 290-290 ◽  
Author(s):  
John C Eidsvik ◽  
John J McKinnon ◽  
Diego Moya Fernandez ◽  
Alexandra Blanchard
Keyword(s):  
Dry Matter ◽  
Average Daily Gain ◽  
Carcass Characteristics ◽  
Feedlot Cattle ◽  
Dry Matter Intake ◽  
Canola Meal ◽  
High Dose ◽  
Marbling Score ◽  
Mineral Supplement ◽  
Dressing Percentage

Abstract The objective was to evaluate growth performance and carcass characteristics for feedlot cattle fed two sources of rumen protected capsaicin at two dose rates. A total of 450 steers, stratified by BW, were assigned into 30 pens. Pens were randomly assigned to receive 1 of 5 treatments containing (DM basis) of 86.2% barley grain, 6.0% barley silage, 6.2% canola meal, and 1.6% vitamin and mineral supplement. Treatments contained no additive (CON) or included a low or high dose of Nexulin (100 mg/d for NEXLO and 330 mg/d for NEXHI) or CapsXL (77 mg/d CAPLO or 250 mg/d for CAPHI). Steers averaged 507 kg BW at the start of the study and 686 kg at the end of the study (69 days on feed) with no differences among treatments (P &gt; 0.28). Dry matter intake, ADG, gain:feed, dressing percentage, backfat thickness, and rib-eye area were not affected by treatment (P &gt; 0.33). Steers fed CAPLO and NEXLO tended (P = 0.07) to have lesser marbling scores than CON, CAPHI and NEXHI. The proportion of steers in Canadian yield grades 1 and 2 did not differ among treatments, while those in yield grade 3 were greater (P = 0.03) in NEXLO (29%) than the CON (10.0%) and NEXHI (12.2%) treatments, with those fed CAPLO (20%) and CAPHI (19%) being intermediate but not different. Treatment did not affect the proportion of steers in quality grades B4, A, or prime, but tended to increase the proportion of steers grading AAA (P = 0.08) and decrease the proportion grading AA (P = 0.06). Overall, the data from this experiment suggest the potential for capsaicin to affect carcass yield grade, marbling score and quality grades without affecting DMI, ADG, or dressing percentage.

EFFECTS OF HIGH FIBRE, AND PELLETED AND NON-PELLETED HIGH FIBRE-HIGH FAT RATIONS ON PERFORMANCE AND CARCASS CHARACTERISTICS OF BACON PIGS

1960 ◽  
Vol 40 (2) ◽  
pp. 126-133 ◽  
Author(s):  
C. D. T. Cameron
Keyword(s):  
Carcass Characteristics ◽  
Red Clover ◽  
Finishing Pigs ◽  
High Fat ◽  
Growing Period ◽  
High Fibre ◽  
Fat Thickness ◽  
Dressing Percentage

A study involving 96 individually-fed growing-finishing pigs was conducted to determine the effects of high fibre, and pelleted and non-pelleted high fibre-high fat rations, on the performance and carcass characteristics of bacon type pigs.Rate of liveweight gain, and gains adjusted to equal feed intakes, decreased when the fibre level was increased by substituting ground mixed timothy-red clover hay for part of the barley in the control rations. Rate of gain increased in the finishing period with the introduction of 5 per cent of stabilized tallow into the high fibre rations.Pelleting the high fibre-high fat rations had little effect on the performance of the pigs in the growing period, while rate of gain increased in the finishing period as a result of the pelleting process. This increase in rate of gain was associated with increased feed intake.High fibre rations resulted in lower dressing percentage and loin fat thickness, and increased Advanced Registry belly and total scores. The addition of 5 per cent of stabilized tallow to the high fibre rations resulted in increased shoulder and loin fat thickness. Pelleting of the high fibre-high fat rations had no significant effect on carcass measurements, although the pigs fed pelleted rations consumed more feed per day and made more rapid gains in the finishing period than those fed the same rations non-pelleted.

scholarly journals 220 A comparison of synovex one alone to synovex choice followed by synovex plus as implant strategies for finishing heifers

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 129-130
Author(s):  
Elizabeth Schumacher ◽  
Galen E Erickson ◽  
D J Jordon ◽  
Robert Cooper ◽  
Tony Scott ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Fixed Effects ◽  
Carcass Characteristics ◽  
Estradiol Benzoate ◽  
Experimental Unit ◽  
Marbling Score ◽  
Arrival Date ◽  
Trenbolone Acetate ◽  
Performance Quality ◽  
Quality Grade

Abstract A commercial feedyard study utilizing crossbred heifers (n = 1,737; initial BW 313 kg) fed for 182 days compared the effect of two implant strategies on performance and carcass characteristics. The study design was a randomized complete block with block as arrival date and initial BW; with pen as the experimental unit (12/treatment). Heifers were implanted with Synovex ONE Feedlot [200 mg trenbolone acetate (TBA), 28 mg estradiol benzoate (EB)] on d 1 (ONE), or implanted with Synovex Choice (100 mg TBA, 14 mg EB) on d 1 followed by Synovex Plus (200 mg TBA, 28 mg EB) on d 95 (CH/Plus). Statistical analysis was conducted using the Mixed procedure of SAS with treatment and block considered fixed effects for performance. Quality grade (QG) and yield grade (YG) data were analyzed using the GLIMMIX procedure of SAS. Implanting with Ch/PLUS tended to improve ADG and HCW (P ≤ 0.13) compared to implanting with ONE. Heifers implanted using ONE tended (P = 0.09) to have greater DMI than CH/PLUS heifers. Intakes were similar (P = 0.34) between treatments before re-implanting, but CH/Plus heifers had lower (P < 0.01) DMI in the final 85 days. Heifers implanted using CH/PLUS had significantly (P < 0.01) greater G:F calculated on a carcass basis compared to heifers implanted with ONE. Heifers implanted with CH/PLUS had significantly (P ≤ 0.02) lower marbling score and YG, higher dressing percentage, and greater LM area compared to heifers implanted with ONE. Heifers implanted with ONE tended to have improved QG distribution (P = 0.06) but poorer YG distribution (P = 0.09) compared to heifers implanted using CH/PLUS. These data suggest that implanting heifers with Synovex ONE Feedlot resulted in slightly less efficiency but better quality grade when fed equal days compared with using Synovex Choice and Plus reimplant program.

The effect of slaughter weight on the carcass characteristics of pork with sex type as co-variable

2016 ◽  
Vol 56 (1) ◽  
pp. 55 ◽  
Author(s):  
E. Pieterse ◽  
L. C. Hoffman ◽  
F. K. Siebrits ◽  
E. L. Gloy ◽  
E. Polawska
Keyword(s):  
Subcutaneous Fat ◽  
Lumbar Vertebrae ◽  
Carcass Characteristics ◽  
Intramuscular Fat ◽  
Muscle Area ◽  
Eye Muscle ◽  
Slaughter Weight ◽  
Sex Type ◽  
Fat Thickness ◽  
Dressing Percentage

A study was conducted with 192 pigs of three sex types with treatments according to slaughter weight (65 kg to 144 kg). The main statistical differences observed were for slaughter weight with significant (P < 0.05) and highly significant (P < 0.01) differences describing more than 10% of variance observed for all characteristics (liveweight, warm carcass weight, dressing percentage, eye muscle area, subcutaneous fat thickness, intramuscular fat area, subcutaneous fat : eye muscle area, intramuscular fat : eye muscle area, fat thickness, muscle depth, carcass length, ham circumference, ham length and chest depth) measured. Sex differences (P < 0.05) were also observed for dressing percentage, fat measurements and muscle depth measured between the 5th and 6th lumbar vertebrae. Sex type differences, in all instances, accounted for 10% or less variance except for subcutaneous fat : eye muscle area ratio (18.47%). It was shown that although significant sex type differences (P < 0.05) existed; slaughter weight had the largest effect on carcass characteristics in the given circumstances accounting for most of the observed variance.

scholarly journals PSV-34 Carcass characteristics of Criollo and Criollo crossbred steers raised on Chihuahuan Desert rangeland

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 338-338
Author(s):  
Matthew McIntosh ◽  
Andres Cibils ◽  
Rick Estell ◽  
Alfredo Gonzalez ◽  
Sheri Spiegal ◽  
...  
Keyword(s):  
South Dakota ◽  
Chihuahuan Desert ◽  
Carcass Characteristics ◽  
High Standard ◽  
Quality Parameters ◽  
Carcass Quality ◽  
Marbling Score ◽  
Randomized Design ◽  
Quality Grade ◽  
Completely Randomized Design

Abstract We compared carcass characteristics of 11 Raramuri Criollo (RC) and 8 Criollo x Brangus crossbred (XC) steers raised together on Chihuahuan Desert rangeland. Steers entered the trial (completely randomized design) at approximately 5 months of age (December, 2015). Initial weights of RC and XC steers were 233.7 ± 7.8 and 231.4 ± 9.2 kg, respectively. Steers weighed 423.1 ± 7.8 (RC) and 483.0 ± 9.2 (XC) kg at 29 months of age (February 1, 2018), before being shipped to South Dakota where they were fed hay for approximately one month until slaughter (February 28, 2018). Carcass characteristics, such as hot (HCW) and cold carcass weights (CCW), preliminary yield grade (PYG), ribeye area (REA), marbling score (MS), and quality grade (QG) were assessed. Breed effects for all variables (excluding QG) were analyzed using SAS Proc Mixed; SAS Proc Npar1way was used to evaluate QG. Compared to XC, RC steers had lighter (P &lt; 0.01) HCW (220 ± 5 vs. 265 ± 6 kg) and CCW (210 ± 5 vs. 254 ± 6 kg), and smaller (P &lt; 0.01) REA (56 ± 1.4 vs. 61.7 ± 1.6 cm2). No differences (P &gt; 0.05) were observed between RC and XC steers in PYG (2.3 ± 0 vs. 2.4 ± 0.2) or MS (452 ± 31 vs. 456 ± 36). Average QG for all carcasses was between high standard and low choice and was not different (P &gt; 0.05) for RC versus XC carcasses. Our preliminary results show no major difference in carcass quality parameters of RC and XC steers developed on Chihuahuan Desert rangeland.

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