Growth performance, carcass traits, and feeder calf value of beef × Holstein and Holstein feedlot steers*

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2024-02-01 DOI:10.15232/aas.2023-02454

M. Pimentel-Concepción , J.R. Jaborek , J.P. Schweihofer , A.J. Garmyn , M.-G.-S. McKendree , B.J. Bradford , A. Hentschl , D.D. Buskirk

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Abstract

Objective

The objective of this study was to compare feedlot performance, carcass traits, and value of beef × Holstein (B × HO) and Holstein (HO) feedlot steers.

Materials and Methods

After a 21-d acclimation to the feedlot, steers (B × HO, n = 60 and HO, n = 60) were blocked by BW into 10 pens per breed type. Steer BW gain, DMI, and G:F were measured on a 28-d basis. Steers were slaughtered at a commercial abattoir on d 245 for B × HO and 266 for HO, after reaching an average carcass empty body fat of 30.0%. Following a 48-h chill, carcass data were collected.

Results and Discussion

The B × HO steers tended to have 5% greater ADG (1.75 vs. 1.70 kg/d) compared with the HO steers but similar DMI (10.40 vs. 10.35 kg/d). The B × HO steers had 4% greater G:F compared with HO steers (0.172 vs. 0.165). Cost of gain was 14% less for B × HO compared with HO steers ($2.68 vs. $2.83/ kg). Although final live BW tended to be less for B × HO compared with HO steers (622 vs. 635 kg), carcass weights were similar between breed types (365 vs. 367 kg). The B × HO steers had 20% greater LM area (87.8 vs. 73.1 cm²), greater backfat thickness (1.18 vs. 0.79 cm), and a lesser average calculated USDA YG (2.9 vs. 3.2) than HO steers. The B × HO and HO steers had similar average marbling scores (426 vs. 437) and USDA QG. Based on abattoir prices, carcass revenue was greater for B × HO steers ($1,836/carcass) when compared with HO steers ($1,800/carcass). Based on a mean receiving BW of 171.9 kg, calculated breakeven feeder calf value was greater for B × HO steers compared with HO steers ($367 vs. $284/100 kg).

Implications and Applications

Overall, B × HO steers were more feed efficient and produced carcasses with more desirable carcass yield, resulting in greater feeder calf value when compared with HO steers.

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牛肉×荷斯坦和荷斯坦饲养场母牛的生长性能、胴体性状和饲养犊牛价值*

材料和方法在饲养场适应 21 天后，按体重将母牛（B × HO，n = 60；HO，n = 60）分隔到每个品种类型的 10 个栏中。每 28 天测量一次母牛的体重增重、DMI 和 G:F。在胴体平均空体脂肪达到 30.0% 后，B × HO 和 HO 牛分别于第 245 天和第 266 天在商业屠宰场屠宰。结果与讨论B × HO 牛的 ADG（1.75 vs. 1.70 kg/d）比 HO 牛高 5%，但 DMI（10.40 vs. 10.35 kg/d）相似。B × HO 牛的 G:F 比 HO 牛高 4%（0.172 比 0.165）。B × HO 牛的增重成本比 HO 牛低 14%（每公斤 2.68 美元对 2.83 美元）。虽然 B × HO 牛的最终活体体重往往低于 HO 牛（622 千克对 635 千克），但不同品种间的胴体重相似（365 千克对 367 千克）。B × HO 牛的 LM 面积（87.8 对 73.1 平方厘米）比 HO 牛大 20%，背膘厚度（1.18 对 0.79 厘米）比 HO 牛大，平均 USDA YG 计算值（2.9 对 3.2）比 HO 牛小。B × HO 牛和 HO 牛的平均大理石纹评分（426 分对 437 分）和 USDA QG 相似。根据屠宰场价格，B × HO 牛的胴体收入（1,836 美元/胴体）高于 HO 牛（1,800 美元/胴体）。总体而言，B × HO 种公牛的饲料效率更高，胴体产量更理想，因此与 HO 种公牛相比，B × HO 种公牛的犊牛饲养价值更高。

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