PROCEEDINGS - American Society of Animal Science

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Table 2. Mean (SE) carcass performance for bulls classified as low (0.5 SD; n=41; RFI=0.887 kg/d) based upon individual residual feed intake (RFI) values. RFI Group Characteristic Low Marginal High P-value Ultrasound Ribeye 14.092 (0.193) 14.247 (0.144) 13.766 (0.183) 0.116 Area Ultrasound Back Fat 0.366 (0.0151) 0.354 (0.0085) 0.373 (0.0133) 0.483 Ultrasound Percent Intramuscular Fat 4.892 (0.183) 4.835 (0.133) 4.963 (0.137) 0.818 Table 3. Mean (SE) carcass character EPDs for bulls classified as low (0.5 SD; n=41; RFI=0.887 kg/d) based upon individual residual feed intake (RFI) values. RFI Group EPD Low Marginal High P-value Ultrasound Ribeye 0.243 (0.029) 0.267 (0.024) 0.211 (0.029) 0.320 Area Ultrasound Back Fat 0.006 (0.002) 0.005 (0.002) 0.007 (0.002) 0.614 Ultrasound Percent Intramuscular Fat 0.177 (0.036) 0.145 (0.023) 0.149 (0.028) 0.705 Table 4. Pearson correlations of residual feed intake (RFI) with performance traits in bulls. Trait RFI (kg/d) P-value Initial Weight (kg) -0.012 0.891 End Weight (kg) -0.044 0.613 Average Daily Gain 0.000 1.000 Midtest Metabolic Weight (kg) 0.000 1.000 DMI (kg/d) 0.702 0.000 Feed Conversion Ratio (feed/gain) 0.490 0.000 Partial Efficiency of Growth -0.898 0.000 (PEG; ADG/DMI for growth) Ultrasound Ribeye Area (REA) -0.125 0.146 Ultrasound Back Fat 0.000 1.000 Ultrasound Percent Intramuscular Fat (PIMF) 0.037 0.670 REA EPD -0.090 0.299 PIMF EPD -0.053 0.538 Back Fat EPD -0.002 0.979 1 Funded in part by the California State University Agricultural Research Initiative and Snyder Livestock Company, Inc.
Proceedings, Western Section, American Society of Animal Science Vol. 60, 2009 RELATIONSHIPS BETWEEN SIRE CALVING EASE EPD AND PROGENY CARCASS PERFORMANCE C. T. Pendley, C. M. McAllister, S. E. Speidel, D.H. Crews, Jr., J. D. Tatum and R. M. Enns Department of Animal Sciences, Colorado State University, Fort Collins 80523 ABSTRACT: Crossbreeding systems commonly make use of terminal sires to improve progeny performance with respect to carcass merit. Direct calving ease (CE) is rarely considered in these situations as terminal sires are typically mated to mature cows. There is also potential to generate heterosis by using terminal sires for mating to first-calf heifers. Based on limited study, CE may be unfavorably related to carcass yield. Therefore, the objective of this study was to estimate the effect of sire CE EPD on USDA yield grade (YG), its components and marbling score in crossbred steer and heifer progeny of terminal yield. Carcass data from steers (n=205) and heifers (n=193), sired by four registered Charolais bulls across four years were obtained from Colorado State University’s Eastern Colorado Research Center. The breed composition of dams was primarily Angus and Angus cross. Steers and heifers were assigned to either high (n = 210) or low (n = 188) CE group on the basis of CE EPD of their sire. Average CE EPD for sires was 2.2 and -0.8 in the high and low groups, respectively. Steers and heifers were harvested at an average age of 417 d and carcass data including hot carcass weight (HCW), 12 th rib subcutaneous fat depth (FAT), longissimus muscle area (REA) and marbling score (MARB) were recorded following routine harvest procedures. Records for YG were computed from component carcass data. Data were analyzed using a general linear model that included the fixed effects of contemporary group (defined as the combination of sex and harvest date), sire CE group, and a linear covariate of harvest age.. Differences in group least squares means were 1.8 cm 2 for REA (P
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Table 2. Effects of calving body co
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ased on average quality and availab
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1 See figure legends for descriptio
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the most important criterions in ra
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Proceedings, Western Section, Ameri
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Results Perceptions of profitabilit
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input cost into the system. Sand an
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Physiological state has also been h
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Table 3 Percent crude protein (CP),
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conducted for 90 d from Dec 1, 2007
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In f o Proceedings, Western Section
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identified in the commercially avai
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The absence of shade in pen decreas
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T e m Figure 2. Impact of three pre
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weaning date can have a positive im
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Table 1. Systems Backgrounding Perf
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Results and Discussion Maximum and
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Figure 2. Oxygen levels of two comp
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contemporary groups where two intac
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Sund, J. M. and M. J. Wright. 1956.
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thiamin), or 4) HIGH (150 mg·hd -1
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Literature Cited Buckner, C. D., T.
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Serum estradiol concentrations were
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Literature Cited AOAC. 1999. Offici
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Results The BFTH contained four and
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The genetic correlation between MS
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Acknowledgements Red Angus Associat
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absorbed from the small intestine (
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ather than May (P < 0.10). Differen
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May July Low Mod High SE Table 3. R
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Aubrey, TX) to achieve a concentrat
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hormone concentrations in stallions
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* * Figure 3. Mean cortisol concent
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in psyllium-supplemented horses but
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References AOAC. 1990. Official Met
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Implications If available and cost
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Slaughter Characteristic of Ram and
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2003). Study 2 included trials in J
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are more accurate than external mar
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than animals fed 24% CP-diet during
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Over complete 28 days fattening exp
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uminally undegradable protein presu
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Todd, A. L., L. M. M. Surber, S. D.
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2006. Effects of supplementing drie
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warm-season annual legumes were use
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parturition was similar for all cow
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Table 3. Average spring 2009 percen
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evaluated based on significant effe
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Table 1. Effect of supplemental cor
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ated by two ultrasound examinations
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Table 1. Percentages of heifers tha
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Treatment 2 was the 12 h interval o
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treated with a CIDR for 14 d exhibi
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≤ ≥ Table 1. Description of cow
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andomly assigned to CO-Synch+CIDR (
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Johnson, S. K., and R. D. Jones. 20
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ultrasound examinations of each ova
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Fernandez, D. L., J. G. Berardinell
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Statistical analysis Data were anal
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physical stress on the body and, th
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hypercortisolism is a characteristi
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FIG. 3. Mean circulating plasma con
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synthesise cDNA. The thermocycler p
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Proportion of cows that were estrua
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January, and homogenized samples fr
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exhibit the presence of a corpus lu
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Even though, mean leptin concentrat
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2004). The swine catheter was used
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Table 2. Breed effect on ewe longev
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the cannula to moderately inflate t
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PGE1, 8-epi-PGF2 alpha, trichosanth
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Experiment 2. Forty-two multiparous
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Table 1. Components of d 7 post-mat
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Medical Solutions Diagnostics, Los
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LITERATURE CITED Camacho, L. E., J.
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lood vessels occur in a physiologic
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after removal of the P4. This possi
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Results of this experiment indicate
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evaporation). The 2 nd component
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15 ng / mL de Progesterone 12 9 6 3
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collections were performed and tota
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Table 2. Effects of corn condensed
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characteristics of the maize grain
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Proceedings, Western Sections, Amer
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lovegrass straw supplemented with d
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Table 1. Dietary treatments Alfalfa
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dairy cows experienced a post-partu
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etention time and the extent of DMD
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Acknowledgement: Research supported
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BW was affected by supplementation
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(NOAA, 2007, 2008; data not shown).
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particles in the diet (Leonardi and
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indicative of larger villi that wou
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treatment, day, and all possible in
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Table 1. Ingredient composition of
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dried distiller’s grains (DDGS; D
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cattle tend to cost 39% more (Ferna
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and those where WDGS and DDGS were
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of preconditioning. This outcome is
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period prior to harvest. Although L
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Plain, R. 2006. Feeding distiller
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were maintained on a single, dorman
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Table 1. Botanical composition of d
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Leu, L-Val, L-Met, L-His, L-Lys, L-
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Table 2. Effects of abomasal Trp in
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Table 1. Experimental supplements c
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Chen, P. S, T. Y. Toribara and H. W
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stimulate ad libitum intake and ort
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concentrate on the nutritive value
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Results and Discussion Dry matter i
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Crouse J.D., J. R. Busboom, R. A. F
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Table 2. Performance of weaned calv
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important role in enteric methane p
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Figure 1. Dynamics of rumen oxidati
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Table 1. Diet composition Item DM b
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120 +LPS -LPS 10.0 8.0 +LPS -LPS To
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(EE), respectively. Sunflower oil (
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Table 4: Fatty acid concentrations
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Kennely, J.J. 1996. The fatty acid
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Davis, K. C., 248 Davis, N. E., 372
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Orosco, G., 409 Ortega, J., 414, 42
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PROCEEDINGS - American Society of Animal Science

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