sire breed
Recently Published Documents


TOTAL DOCUMENTS

186
(FIVE YEARS 16)

H-INDEX

23
(FIVE YEARS 1)

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 291-291
Author(s):  
Harley Buie ◽  
Noah P Jesko

Abstract Live animal ultrasound measurements were taken on thirty-two feedlot steers and heifers for estimation of carcass endpoints including 12th rib fat thickness (FTU), ribeye area (REAU) and intramuscular fat (%FatU). Ultrasound measurements were collected by an inexperienced technician using an Aloka 500 ultrasound unit using Beef Image Analysis (BIA) software. The objective of the study was to evaluate carcass differences of four sire breed types including Angus (n = 11), Ultrablack (n = 6), Nelore (n = 6), Braunvieh (n = 1) and Angus X Nelore X Braunvieh hybrid (n = 8). Carcass data collected at harvest included 12th rib fat Thickness (FTC), Ribeye area (REAC), marbling score (MS), Yield Grade (YG), and Quality Grade (QG). The data were analyzed using SAS to determine breed effects. Means for FTU, FTC, REAU, REAC, %FatU and MS were 0.59 cm, 0.57 cm, 90.80 cm2, 83.53 cm2, 4.83%, and 483.75, respectively. There was no significant difference (P > 0.05) in YG and FT due to breed of sire. However, there was a trend for sire breed for ribeye area (P = 0.0728) for Angus X Nelore X Braunvieh cross and MS (P = 0.0786) for Ultrablack. Pearson correlation values between FTU and FTC, REAU and REAC, and %FatU and MS were 0.1217 (P = 0.05068), 0.3545 (P = .0465) and 0.5161 (P = 0.0025), respectively. These data suggest little differences existed in carcass attributes between various sire breeds out of a set of crossbred commercial cows.


2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 351-352
Author(s):  
Maslyn A Greene ◽  
Susan K Duckett

Abstract Suffolk ewes (n = 26) were blocked by body condition and weight, and randomly divided into two breeding groups (n = 13/group). One group was bred to a Texel ram and the other to a Suffolk ram. Ewes were confirmed pregnant by ultrasound and went to term. Male lambs (n = 4/sire/time) were harvested on d 2, 14, and 203 of age for muscle characterization and satellite cell isolation. From d 2 to 14, body weight increased (P < 0.01) by 80%, weight of the longissimus increased by 160%, and longissimus muscle area increased by 100%. Between d 14 and 203 lamb weight and weight of the longissimus increased by 350%, while longissimus area only increased by 100%. Sire breed did not alter lamb weight or weight of the longissimus (P > 0.10). Longissimus muscle area tended (P < 0.10) to be increased for Texel sired lambs when compared to Suffolk sired lambs. The total number of satellite cells isolated were not different by sire breed but did differ by animal age (P < 0.01). Satellite cell populations per gram of tissue increased between d 2 and 14 and decreased from d 14 to 203. Due to the large changes in growth from d2 to 14, satellite cell proliferation was examined at d 2 of age. Satellite cell proliferation capacity was altered by sire breed at d 2 of age potentially contributing to the increased longissimus muscle area. Advancing animal age and development alters satellite cell population numbers and potentially supports a high capacity for growth.


Author(s):  
Phillip A Lancaster ◽  
Luis O Tedeschi ◽  
Zach Buessing ◽  
Michael E Davis

Abstract Nutrition models are important tools in management decisions, but improvements are needed for cow-calf producers to accurately predict nursing calf performance. Therefore, the objective of this study was to assess the ability of published milk yield and forage intake equations to predict calf feed intake and weaning weight using an independent, multi-breed dataset. A dataset with 406 nursing calves was used to evaluate two milk yield (MY) equations: 1) (NASEM) National Academies of Sciences, Engineering, and Medicine (2016) and 2) (WOOD) Wood (1967), and five feed intake equations: 1) (TED06) equations from Table 9.1 in Tedeschi et al. (2006), 2) (BAK76) equations 2 to 7 in Baker et al. (1976), 3) (TED09A) equation 25 in Tedeschi and Fox (2009), 4) (TED09B) equations 17, 19, and 24 in Tedeschi and Fox (2009), and 5) (HOL82) equation from Holloway et al. (1982). Milk yield was measured at 14-d intervals by hand milking, and individual feed intake of nursing calves was determined during a 240-d nursing period. Calf birth and weaning weight (WW) were measured on d 0 and 240, respectively. Each combination of milk yield and feed intake equation was used to predict calf feed intake and WW from observed milk yield, calf birth weight, and calf slaughter weight. Predicted and observed values were compared using concordance correlation coefficient (CCC) and mean bias (MB). Factors affecting the deviation between observed and predicted values were analyzed using regression, and a revised equation was developed. Feed intake equations poorly predicted observed feed intake with CCC < 0.4 and MB ranged from -108 to 69%. However, statistics were slightly improved when using WOOD rather than the NASEM MY equation. BAK76 and TED09B feed intake equations were considerably more accurate (MB = -14.4 to 13.0%) in predicting feed intake, but still not precise (CCC < 0.30). Predictions of WW had CCC ranging from 0.19 to 0.71 and MB ranging from -25.9 to 41.8% and were not significantly affected by the MY equation. TED06 and BAK76 feed intake equations were the most precise (CCC > 0.60) and accurate (MB = 1.7 to 8.5%) in predicting WW. Sire breed accounted for significant variation in the deviation between observed and predicted values of feed intake, and in a revised equation to predict total feed energy intake from total milk energy intake. In conclusion, refinements of feed intake equations for nursing calves need to account for breed to improve current nutrition models.


Author(s):  
A.P. Moloney ◽  
B. Picard ◽  
L. Moran

The effects on tenderness of extended ageing of longissimus thoracis (LT, striploin) muscle that differed in structure and composition were examined. Spring-born Angus × Holstein-Friesian heifers (n = 48) and Belgian Blue × Holstein-Friesian heifers (n = 48) were slaughtered, within sire breed, at 20 or 25 mo of age. Approximately 48 h post-mortem, LT steaks (2.5 cm) were removed, and either stored at −20°C for chemical analysis or vacuum-packed, stored at 2°C for 7, 14 or 28 d post-mortem and then at −20°C pending Warner–Bratzler shear force (WBSF) analysis. Muscle from Angus-sired heifers had higher (P < 0.001) intramuscular fat (IMF) concentration, lower (P < 0.001) proportion of type IIX muscle fibres and higher (P < 0.001) proportion of type IIA and type I muscle fibres compared to muscle from Belgian Blue-sired heifers. Collagen characteristics did not differ between sire breeds. Later slaughter increased (P < 0.001) IMF concentration and decreased (P < 0.001) total and insoluble concentrations and collagen solubility. There were no interactions between the main effects for WBSF and no difference between sire breeds. Later slaughter and increasing the duration of ageing decreased (P < 0.05) WBSF. Based on threshold WBSF values in the literature, all samples would be considered tender (<39 N) after 7 d ageing. Untrained consumers are likely to detect the decrease in WBSF from 7 to 14 d ageing but not due to further ageing. Within the production system examined and based on WBSF data, extending LT ageing to 28 d is not necessary to ensure consumer satisfaction.


Author(s):  
T W Murphy ◽  
B A Freking

Abstract Objective was to evaluate wool (Dorset and Rambouillet) and hair (Dorper, Katahdin, and White Dorper) breeds for their ability to complement Romanov germplasm in an annual fall lambing system by estimating direct maternal grandsire and sire breed effects on economically important lamb and ewe traits. After 3 yr of evaluation under spring lambing, ewes of the 5 F1 types were transitioned to spring mating, exposed to composite terminal sires, and evaluated under a barn lambing system at 4, 5, and 6 yr of age. A total of 527 F1 crossbred ewes produced 1151 litters and 2248 lambs from 1378 May exposures. After accounting for differences in dam age, birth type, and sex, lamb survival to weaning was unaffected by maternal grandsire breed (P = 0.30). However, lambs born to 50% Dorset (16.8 ± 0.21 kg) or 50% White Dorper ewes (16.8 ± 0.28 kg) were heavier at weaning than those born to 50% Katahdin dams (13.8 ± 0.32 kg; P &lt; 0.001). Additionally, lambs born to 50% Dorset ewes were heavier than those born to 50% Rambouillet (16.0 ± 0.22 kg) and 50% Dorper ewes (15.7 ± 0.33; P ≤ 0.03), but no other pairwise maternal grandsire breed differences were observed (P ≥ 0.06). Ewe body weight (n = 3629) was recorded prior to each of 6 possible mating seasons and, across ages, was greatest for Dorset and Rambouillet sired ewes (56.7 ± 0.44 and 56.5 ± 0.45 kg, respectively), intermediate for Dorper and White Dorper sired ewes (54.7 ± 0.78 and 54.1 ± 0.64 kg, respectively), and least for Katahdin sired ewes (51.5 ± 0.45 kg). Fertility after spring mating (0.80 ± 0.03 to 0.87 ± 0.02), litter size at birth (1.46 ± 0.09 to 1.71 ± 0.07), and litter size at weaning (1.25 ± 0.06 to 1.46 ± 0.06) were not impacted by sire breed (P ≥ 0.16). Ewe longevity, assessed as the probability of being present after 6 production years, was also not affected by sire breed (0.39 ± 0.03 to 0.47 ± 0.03; P = 0.44). Rambouillet sired ewes weaned more total weight of lamb (21.5 ± 0.94 kg) than Katahdin sired ewes (17.8 ± 0.94 kg; P = 0.05), but no other sire breed differences were detected (P ≥ 0.07). Results demonstrated that incorporating the Romanov into a crossbreeding system is a practical means of improving out-of-season ewe productivity.


Author(s):  
Brad A Freking ◽  
Tom W Murphy

Abstract Objective was to evaluate wool (Dorset and Rambouillet) and hair (Dorper, Katahdin, and White Dorper) breeds for their ability to complement Romanov germplasm in two distinct production systems by estimating direct sire and grandsire effects on lamb growth, survival, and ewe productivity traits. Rams of the five breeds (n=75) were mated to Romanov ewes (n=459) over a 3 yr period to produce five types of crossbred lambs (n=2739). Sire breed (P &gt; 0.06) did not impact body weight (BW) or survival traits of the first generation crossbred (F1) lambs. Productivity of retained crossbred ewes (n=830) mated to Suffolk and Texel terminal sires was evaluated at 1, 2 and 3 years of age in each production system. In the intensive production system, labor and harvested feed were provided for sheep that lambed in March in barns and ewes were limited to rearing two lambs with additional lambs reared artificially. Ewes in the extensive production system lambed in May on pasture and were responsible for rearing all lambs born with no labor or supplemental feed provided before weaning. A total of 1,962 litters and 4,171 lambs from 2,229 exposures to two terminal sire breeds (Suffolk, Texel) was produced in the experiment. Crossbred ewes in the intensive production system were mated in October, resulting in larger litter sizes than crossbred ewes mated in December for the extensive production system. However, single and twin born lamb mortality was similar between the two systems that differed greatly in labor, feed, and facilities. Lambs produced in the intensive system received concentrate feed from an early age and were heavier at 24 wk of age than lambs produced in the extensive system. These outcomes resulted in greater 24-wk litter weight in the intensive than in the extensive system (P &lt; 0.0001). Unexpectedly, the relative performance of crossbred types did not differ importantly between production systems. White Dorper x Romanov crossbred ewes had numerical advantages in productivity in each system, however differences between ewe types were not significant. In the extensive system, without labor and shelter at lambing or supplemental feed until weaning, 3-year-old crossbred ewes of all types averaged 1.78 lambs marketed per ewe lambing and 40% of the ewes that gave birth to triplets weaned their entire litters. These results document that prolific sheep and extensive systems can be successfully combined if appropriate crossbred types are used.


2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 206-207
Author(s):  
Tom Murphy ◽  
Whit C Stewart ◽  
Dave Notter ◽  
Ryan Knuth ◽  
Trestin Feagler ◽  
...  

Abstract Objectives were to evaluate breed, heterosis (HI), and maternal effects on wool production in Rambouillet (R x R), Targhee (T x T), and reciprocal-cross (R x T and T x R) 1-yr-old ewes. Greasy fleece weights (GFW) were obtained at shearing and mid-side, britch, and whole-fleece core wool samples were collected to quantify average (A-FD) and CV of fiber diameter (CV-FD). Laboratory scoured yield (LSY) was quantified on core samples and used to estimate clean fleece weight (CFW). Single-born ewes had greater GFW (3.48 kg), greater CFW (2.11 kg), and lower mid-side CV-FD (17.5%) than multiple-born ewes (3.18 kg, 1.95 kg, and 18.1%, respectively; P &lt; 0.01). Rambouillet-sired ewes had greater LSY than T-sired ewes (60.6 vs. 60.0%; P &lt; 0.01), but no breed effects were detected for GFW or CFW. A sire breed x dam breed interaction effect was detected for A-FD at all locations (P ≤ 0.05). Reciprocal-cross performance indicated unfavorable HI for A-FD within mid-side (+0.34 μm), britch (+0.97 μm), and core samples (+0.42 μm; P ≤ 0.05) compared to purebred average. Greater mid-side and britch A-FD in R x T (22.8 and 25.2 μm) than T x R ewes (21.2 and 23.5 μm; P &lt; 0.01) implied a more favorable additive maternal effect for crossbred ewes gestated and reared by R compared to T dams. Future analyses will consider lifetime lamb and wool production of these breed types to evaluate the utility of finewool crossbred ewes in extensive production systems.


2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 73-74
Author(s):  
Emily G Hayes ◽  
Lauren Stevens ◽  
Shaneqwa Thomas ◽  
Kaylee Hurt ◽  
Richard Browning

Abstract This study examined the influence of creep feeding and sire breed on post-weaning replacement doeling traits. Over 3 years, doelings by Kiko, Myotonic, Spanish and Savanna sires were creep-fed (CF; n = 116) for 60 d or not creep-fed (NC; n = 117). Sire breeds were balanced across creep treatments. Doelings were weighed at 3 mo old (weaning) and various postweaning ages. Doelings entered the breeding herd at 18 mo of age and fitness traits recorded. At 3-, 6-, and 12-mo of age CF (14.7 ± 0.6, 19.3 ± 1.2, and 24.6 ± 0.9 kg, respectively) were heavier (P &lt; 0.05) than NC (13.8 ± 0.6, 17.9 ± 1.2, and 23.6 ± 0.9 kg, respectively). Treatment did not affect 18-mo weights. Sire breed did not affect 3-mo weight. Sire breed influenced (P &lt; 0.05) 6-, 12-, and 18-mo weights. Myotonic-sired doelings were lightest (P &lt; 0.05) and Kiko-sired doelings were heavier (P &lt; 0.05) than Savanna-sired. Breed x treatment interacted (P &lt; 0.05) for survival to 18 mo of age. Kiko-sired CF doelings had a higher (P &lt; 0.05) survival rate than Savanna-sired CF (88.6 ± 6.0% vs. 44.6 ± 11.5%). Breed did not affect survival rate (P&gt; 0.05) within the NC group. As a main effect, CF had a higher (P &lt; 0.05) survival rate than NC (81.5 ± 6.3% vs. 65.6 ± 8.7%). Sire breed affected (P &lt; 0.05) reproductive output. Cumulative kid crop weaned across the first 2 breeding years for the whole weaned doeling population was higher (P &lt; 0.05) for Myotonic- and Kiko-sired (1.4 and 1.2 ± 0.2 kids) does than Savanna-sired (0.5 ± 0.1 kids). Creep feeding did not affect reproductive output. Creep feed supplementation and sire breed influenced post-weaning doeling weights. Only sire breed affected reproductive performance of the young does.


2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 69-69
Author(s):  
Lauren Stevens ◽  
Emily G Hayes ◽  
Piush Khanal ◽  
Shaneqwa Thomas ◽  
Mozell Byars ◽  
...  

Abstract Savanna sires were evaluated for kid preweaning and doe reproductive traits over six years. Savanna (n = 17) and Kiko (n = 13) sires were bred to Kiko-base does producing 600 kids. Savanna (n = 17) and Spanish (n = 11) sires were bred to Spanish-base does producing 456 kids. Doe traits were evaluated on 536 Kiko and 441 Spanish doe exposures. Kids were weighed at birth and when weaned at 3 mo of age. Non-genetic factors sex and litter size influenced (P &lt; 0.05) kid performance traits as expected. Birth weights of kids from Kiko does were heavier (P &lt; 0.01) for Savanna sires than Kiko sires (3.11 vs. 2.83 ± 0.08 kg). Birth weights of kids from Spanish does were heavier (P &lt; 0.01) for Savanna sires than Spanish sires (3.05 vs. 2.76 ± 0.09 kg). Sire breed did not affect (P &lt; 0.05) weaning weight from Kiko does (15.0 vs 14.8 ±0.6 kg). Savanna sires generated heavier (P &lt; 0.05) weaning weights than Spanish sires (14.2 vs. 13.3 ± 0.6 kg) from Spanish does. Sire breed did not affect ADG or kid survival rates in either doe group. Non-genetic factors litter size and age of dam affected (P &lt; 0.05) doe performance traits in both doe groups. Savanna sires produced heavier litters (P &lt; 0.01) at birth compared to Kiko sires on Kiko does (10.7 vs. 9.7 ± 0.4 kg) and compared to Spanish sires on Spanish does (9.4 vs. 8.3 ± 0.5 kg). Service sire breed did not affect kidding or weaning rate, number of kids born or weaned, or litter weaning weight in either doe group. Savanna sires consistently increased birth weight values. Sire breed did not consistently affect weaning weight values and did not influence other preweaning kid traits or doe reproductive traits.


Sign in / Sign up

Export Citation Format

Share Document