scholarly journals 80 Evaluation of extended release eprinomectin efficacy on multiparous beef cow performance

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 11-11
Author(s):  
Laine Zammit ◽  
Jermey G Powell ◽  
Reagan N Cauble ◽  
Toby D Lester ◽  
Callan Lichtenwalter ◽  
...  
Keyword(s):  
Extended Release ◽  
Reproductive Traits ◽  
Economic Loss ◽  
Beef Cows ◽  
Negative Control ◽  
Beef Cow ◽  
Body Weights ◽  
Calving Season ◽  
Cow Performance ◽  
Fall Calving

Abstract Internal parasitism inevitability prompts economic loss in beef cattle production by decreasing growth performance and reproductive traits. Previous studies have conflicting results on the macrocyclic lactones (ML) efficacy against internal parasitism. The objective of this study was to evaluate the efficacy of milbeymycin and avermectin sub groups of ML on cow performance. Multiparous fall calving, crossbred beef cows (n = 106) were allocated randomly to 1 of 3 anthelmintic treatments: 1) Negative control (CON), in which cows did not receive an anthelmintic, 2) Injectable moxidectin (MOX) and 3) Injectable extended release eprinomectin (ERE). Body weights (BW), body condition scores (BCS), and fecal egg counts (FEC) were taken throughout the duration of the calving season to weaning on d0, d80, d162, and d217, with weaning occurring on d217. Performance data were analyzed using the MIXED procedures of SAS, and pregnancy data were analyzed using the GENMOD procedures of SAS. Significance was fixed at P < 0.05 and tendencies were established from 0.05 ≤ P ≤ 0.10. There was no effect of anthelmintic treatment on cow BW (P ≥ 0.57) or cow BCS (P ≥ 0.22) during the 217 d study; however, CON cows tended to have lower BCS (P = 0.08) throughout the duration of the study. Cows treated with ERE had fewer FEC compared to MOX and CON groups (P ≤ 0.001) and tended to improve pregnancy rates (c2 = 0.0546). Calf weaning weight was similar among treatments averaging 216, 225, and 223 kg regarding CON, MOX, and ERE cow treatments, respectively.

scholarly journals 79 Evaluation of extended release eprinomectin efficacy on multiparous beef cow performance

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 60-61
Author(s):  
Laine Zammit ◽  
Jermey G Powell ◽  
Reagan N Cauble ◽  
Toby D Lester ◽  
Callan Lichtenwalter ◽  
...  
Keyword(s):  
Extended Release ◽  
Reproductive Traits ◽  
Economic Loss ◽  
Beef Cows ◽  
Negative Control ◽  
Beef Cow ◽  
Body Weights ◽  
Calving Season ◽  
Cow Performance ◽  
Fall Calving

Abstract Internal parasitism inevitability prompts economic loss in beef cattle production by decreasing growth performance and reproductive traits. Previous studies have conflicting results on the macrocyclic lactones (ML) efficacy against internal parasitism. The objective of this study was to evaluate the efficacy of milbeymycin and avermectin sub groups of ML on cow performance. Multiparous fall calving, crossbred beef cows (n = 106) were allocated randomly to 1 of 3 anthelmintic treatments: 1) Negative control (CON), in which cows did not receive an anthelmintic, 2) Injectable moxidectin (MOX) and 3) Injectable extended release eprinomectin (ERE). Body weights (BW), body condition scores (BCS), and fecal egg counts (FEC) were taken throughout the duration of the calving season to weaning on d0, d80, d162, and d217, with weaning occurring on d217. Performance data were analyzed using the MIXED procedures of SAS, and pregnancy data were analyzed using the GENMOD procedures of SAS. Significance was fixed at P < 0.05 and tendencies were established from 0.05 ≤ P ≤ 0.10. There was no effect of anthelmintic treatment on cow BW (P ≥ 0.57) or cow BCS (P ≥ 0.22) during the 217 d study; however, CON cows tended to have lower BCS (P = 0.08) throughout the duration of the study. Cows treated with ERE had fewer FEC compared to MOX and CON groups (P ≤ 0.001), and tended to improve pregnancy rates (c2 = 0.0546). Calf weaning weight was similar among treatments averaging 216, 225, and 223 kg regarding CON, MOX, and ERE cow treatments, respectively.

scholarly journals 156 Injectable trace mineral supplementation on grazing beef cows: effect on overall mineral status and fertility

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 117-117
Author(s):  
Stefania Pancini ◽  
John Currin ◽  
Jamie L Stewart ◽  
Sherrie Clark ◽  
Tracey Redifer ◽  
...  
Keyword(s):  
Pregnancy Rate ◽  
Body Condition Score ◽  
Post Partum ◽  
Fixed Time ◽  
Beef Cows ◽  
Negative Control ◽  
Trace Mineral ◽  
Mineral Status ◽  
Beef Cow ◽  
Estrus Detection

Abstract The objective of this study was to evaluate the effect of two doses of an injectable multi-mineral complex supplementation on beef cow fertility and overall mineral status. A total of 986 Angus crossbred multiparous cows at 8 locations in Virginia were enrolled in a 7-day CO-Synch+CIDR fixed-time artificial insemination (FTAI) protocol, followed by natural service for an approximately 70 d breeding season. All cows had ad libitum access to water, mineral blocks, and diet composed of hay, grass, sudangrass, sorghum grain and commodity pellets, depending on location. Approximately 30 days before calving (d -120, day of AI is d 0) cows were randomly assigned to one of two treatments: 1) Two doses (6 mL) of Multimin® 90 (Multimin USA, Ft. Collins, CO) at d -120 and d -10 (MIN; n = 494); or 2) a negative control with no trace mineral injection (CTRL; n = 492). Body condition score was recorded on d -10, 60 and 120. Estrus detection was recorded at d 0 using estrus detection patches. Pregnancy was diagnosed on d 60 and 120 by ultrasonography. Liver biopsies were collected on d -10 and 60 in a subgroup of 60 cows equally distributed between treatments and among all locations. No differences between treatments were detected in days post-partum (P = 0.66), BCS (P = 0.24) and estrus expression (P = 0.11). Mineral status of copper, manganese, selenium or zinc was similar between treatments before (P = 0.20) and after treatment (P = 0.17). No effect of treatment was detected in FTAI pregnancy rate (50.8%, P = 0.52) or overall pregnancy rate (89.6%, P = 0.64). Two doses of injectable trace mineral administrated approximately 30 days before calving and 10 days before FTAI did not improve pregnancy rate or overall mineral status in multiparous beef cows in Virginia.

scholarly journals Impact of Weather and Herd Size Management on Beef Cow Profitability

2019 ◽  
Vol 51 (04) ◽  
pp. 545-567 ◽  
Author(s):  
Colson A. Tester ◽  
Michael P. Popp ◽  
Nathan P. Kemper ◽  
Lanier L. Nalley ◽  
Grant West
Keyword(s):  
Management Strategy ◽  
Herd Size ◽  
Land Use Intensity ◽  
Income Risk ◽  
Fertilizer Use ◽  
Beef Cow ◽  
Time Period ◽  
Price Trends ◽  
Calving Season ◽  
Fall Calving

AbstractProducers often contemplate expanding or contracting production to take advantage of cyclical cattle price trends. This study quantifies profitability and risk implications of (1) constant herd size, (2) dollar cost averaging, and (3) price signal-based, anticipatory countercyclical expansion/contraction strategies. Weather simulation on forages with different calving season and land use intensity showed fall calving herds with added hay sales from greater fertilizer use and the countercyclical herd size management strategy to be most profitable regardless of weather or time period analyzed. Income risk was comparable to least fertilizer use. Overall, holding herd size constant led to little regret.

An integrated approach to crop/livestock systems: Wintering beef cows on swathed crops

2005 ◽  
Vol 20 (4) ◽  
pp. 232-242 ◽  
Author(s):  
J.F. Karn ◽  
D.L. Tanaka ◽  
M.A. Liebig ◽  
R.E. Ries ◽  
S.L. Kronberg ◽  
...  
Keyword(s):  
Crop Residue ◽  
Integrated Approach ◽  
Beef Cows ◽  
Beef Cow ◽  
Western Wheatgrass ◽  
Feeding Costs ◽  
Calf Performance ◽  
Weight Gain Data ◽  
Cow Performance ◽  
Feed Costs

AbstractGrain and livestock production have gradually been separated, as farmers have tended to specialize in one or the other. Some producers and scientists are beginning to question whether this is the best approach. An integrated crop/livestock project was initiated in 1999 to investigate potentially beneficial synergies to both enterprises. The cattle portion of this project involved wintering dry pregnant cows on swathed crop residue and drilled corn produced in a 3-year crop rotation, with all crops present each year. Swath grazing was initiated in mid-November of 1999, 2000 and 2001, and terminated in mid-February each year. Two replications of ten Hereford cows were rotationally grazed on swathed oat/pea and triticale crop residue and swathed drilled corn (RGSC). Comparison treatments were: cows grazing swathed western wheatgrass (SWWG) and cows fed hay in a drylot. Cows on the RGSC treatment were also fed a 20% crude protein supplement of oat/pea and triticale grain. Drilled corn was swathed in late September and western wheatgrass in early October. Three-year average winter-long weight gains for the RGSC cows were slightly lower (P<0.10) than those for drylot cows. Body condition scores generally followed the same pattern as weight gain data. Reproductive and calf performance data were not significantly different among wintering treatments. Average daily feed costs per cow over the three winters were US$0.49, 0.65 and 0.73 for RGSC, SWWG and baled hay in a drylot, respectively, providing a potential daily savings of US$0.24 per cow with the RGSC treatment compared to bale feeding in a drylot. Swath grazing did not appear to have any adverse affects on mid-aged beef cow performance and could potentially reduce winter feeding costs and manure handling problems. The main problem with swath grazing is potentially deep snow and icing of the swaths.

scholarly journals Effects of extended-release eprinomectin on fescue toxicosis, performance, and reproduction on fall-calving beef cows

2019 ◽  
Vol 3 (4) ◽  
pp. 1423-1434
Author(s):  
Mareah J Volk ◽  
Taylor R Krause ◽  
Rebecca S Stokes ◽  
Frank A Ireland ◽  
Daniel W Shike
Keyword(s):  
Milk Production ◽  
Tall Fescue ◽  
Extended Release ◽  
Treatment Time ◽  
Beef Cows ◽  
Serum Prolactin ◽  
Fescue Toxicosis ◽  
Time Interaction ◽  
Tick Count ◽  
Fall Calving

Abstract The objective of this experiment was to evaluate effects of extended-release eprinomectin on fescue toxicosis and impacts on performance and reproduction in fall-calving beef cows. Fall-calving Angus × Simmental multiparous cows [n = 335; age = 5.8 ± 2.1 yr; 586.5 ± 6.0 kg body weight (BW); 5.48 ± 0.05 body condition score (BCS)] were stratified by BW, age, and BCS and randomly assigned to one of three treatments. Treatments included a spring injection of extended-release eprinomectin (SERE) on day 0, a fall injection of extended-release eprinomectin injection (FERE) on day 84, and a saline control (CON). All treatments were administered at a rate of 1 mL/50 kg BW. Prior to the experiment, all cows were treated with oral fenbendazole to minimize parasite load. Cows grazed endophyte-infected tall fescue. Hair coat score (HCS), BW, and BCS were recorded on all cattle. Fecal egg count (FEC), respiration rate (RR), horn fly and tick count, hematocrit (% packed cell volume, PCV), and serum prolactin were analyzed on a subset of cows (35/treatment). On day 194, cows were artificially inseminated (AI) and 11 d following AI were exposed to bulls for 51 d. Milk production was estimated on day 210 on a subset of 85 cow–calf pairs (28–29/treatment). There was a tendency for a treatment × time interaction (P = 0.07) for FEC likely driven by an increase in FEC of the CON cattle at day 126 compared to SERE and FERE. There was a tendency for a treatment × time interaction (P = 0.06) for cow BW, largely driven by time differences; however, there was no effect of treatment (P = 0.84) on BW. There was no difference (P ≥ 0.13) in cow PCV, fly and tick count, BCS, HCS, RR, and serum prolactin throughout the experiment. Additionally, there was no difference (P ≥ 0.46) in Julian calving date, calf birth BW, or milk production between treatments. Interestingly, heifer calves born to FERE dams tended to have greater (P = 0.06) weaning BW compared to heifer calves born to CON dams. In addition, there was no difference (P ≥ 0.17) in heat patch scores, AI conception rates, or overall pregnancy rates between treatments. Extended-release eprinomectin did not impact cow growth performance, reproductive performance or fescue toxicity symptoms when grazing endophyte-infected tall fescue; however, calf weaning BW tended to be improved.

scholarly journals 210 Effects of supplementing calcium salts of fatty acids during late gestation on beef cow performance and offspring pre-weaning performance

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 155-156
Author(s):  
Taoqi Shao ◽  
Lucas T Neira ◽  
Daniel W Shike
Keyword(s):  
Fatty Acids ◽  
Growth Performance ◽  
Milk Yield ◽  
Beef Cows ◽  
Blood Parameters ◽  
Late Gestation ◽  
Middle Point ◽  
Total N ◽  
Beef Cow ◽  
Cow Performance

Abstract Objectives were to investigate the effects of late-gestation supplementation of Ca salts of fatty acids to beef cows on cow performance and offspring pre-weaning growth performance. One hundred and ninety fall-calving, Angus Simmental cows were ranked by BW, BCS, and age. Cows were randomly assigned into 12 endophyte-infected, tall fescue pastures (4 pastures/treatment; 15–16 cows/pasture). Cows were fed an isocaloric supplement with soybean hulls mixed with: whole-shelled corn (CON), 155 g/cow/d of EnerGII (SFA/MUFA), or 40 g/cow/d of Strata 120 g/cow/d of Prequel (PUFA) during the last 83 4.9 d of gestation. Cow BW and BCS were measured at the initial, middle point, and end of supplementation, as well as at breeding and weaning. Milk yield was evaluated by weigh-suckle-weigh technique at 675.0 d postpartum. Steers were weaned at 174 5.0 d of age. Growth performance, milk, and blood parameters were analyzed with MIXED and reproductive data were analyzed with GLIMMIX procedures of SAS. The BW and BCS of the cows were not different (P 0.19) from trial initiation through weaning. Birth BW of the steers was not different (P = 0.62). The AI or overall pregnancy rates were not different (P 0.88). There was no difference (P 0.12) in milk yield or components. However, C15:0 and total n-3 fatty acids in milk from dams supplemented with PUFA was greater (P 0.05) than CON, while SFA/MUFA was intermediate and not different than the others. There was no difference (P = 0.83) for weaning BW of the steers. In conclusion, late-gestation supplementation of Ca salts of PUFA had no effect on cow BW, BCS, or milk yield, but increased total n-3 fatty acids in milk. Neither birth BW nor weaning BW of steers were affected by maternal fatty acid supplementation.

Effects of Feeding Graded Levels of Black Spruce Needles and Branches on Beef Cow Performance and Health During Mid to Late Gestation

2020 ◽  
Author(s):  
Carole Lafreniere ◽  
Robert Berthiaume ◽  
Leo Giesen ◽  
Cheryl Campbell ◽  
Dale Gardner ◽  
...  
Keyword(s):  
Body Condition Score ◽  
Black Spruce ◽  
Block Design ◽  
Average Daily Gain ◽  
Dietary Treatment ◽  
Beef Cows ◽  
Late Gestation ◽  
Beef Cow ◽  
Condition Score ◽  
Cow Performance

Pregnant beef cows (56; 727 ± 102 kg BW) in second trimester were used to examine black spruce (BSP) needles and branches for replacing alfalfa silage in wintering cow diets. Five dietary treatments assessed BSP inclusion rates (0, 15, 22.5, 30, 37.5% in the diet) for 92 days up until 2 weeks before start of calving using a randomized complete block design (10-12 cows/treatment). There were linear decreases (P < 0.001) in total weight gain, average daily gain (ADG) and dry matter intakes (DMI) as amounts of dietary BSP increased. Low DMI feeding BSP may be attributed to palatability issues and lower rates of digestion. Changes in body condition score (BCS) increased(P < 0.003) as dietary BSP increased. These effects are supported by corresponding linear decreases (P < 0.001) for changes in rump fat cover and increases (P < 0.001) in serum non-esterified fatty acids as dietary BSP increased. Post-feeding of test diets, there were no dietary treatment differences (P > 0.42) for calf birth and weaning weights and cow pregnancy and culling rates. Based on this study, incorporation of BSP into gestating cow diets cannot be recommended.

Effects of late gestation distillers grains supplementation on fall-calving beef cow performance and steer calf growth and carcass characteristics

2015 ◽  
Vol 93 (10) ◽  
pp. 4843-4851 ◽  
Author(s):  
T. B. Wilson ◽  
A. R. Schroeder ◽  
F. A. Ireland ◽  
D. B. Faulkner ◽  
D. W. Shike
Keyword(s):  
Carcass Characteristics ◽  
Late Gestation ◽  
Distillers Grains ◽  
Calf Growth ◽  
Beef Cow ◽  
Cow Performance ◽  
Fall Calving

Effects of early versus late spring calving on beef cow-calf productivity

1998 ◽  
Vol 78 (3) ◽  
pp. 249-255 ◽  
Author(s):  
H. Pang ◽  
M. Makarechian ◽  
L. A. Goonewardene ◽  
R. T. Berg
Keyword(s):  
Reproductive Traits ◽  
University Of Alberta ◽  
Beef Cow ◽  
Higher Weights ◽  
Time Of Breeding ◽  
Cow Calf ◽  
Calving Season ◽  
The University ◽  
Late Group ◽  
Body Condition Scores

Early (April) vs. late (May/June) calving was compared over 3 yr at the University of Alberta Ranch at Kinsella, Alberta, Canada. Three synthetic lines, two of which were predominantly beef breeds (BS1 and BS2) and one with approximately 60% dairy breeding (DS) were used and 995 records were analyzed. Cows from each line were randomly allotted to the early or late breeding schedules at the time of breeding. The same bulls bred cows in their own line, beginning in June and in August for two 6-wk periods. Calving season had no significant effect (P > 0.05) on pregnancy rate (%), calving assistance, calving and weaning rate (%), adjusted off-test weight or post-weaning ADG, suggesting that late calving can be a viable management option. Birth weights of all calves were significantly lower in the early group than in the late group (38.9 vs. 41.2 kg, P < 0.01). In the BS1 and BS2 lines, early calves had higher adjusted pre-weaning ADG: BS1 (1.18 vs. 1.11 kg d−1, P < 0.01), BS2 (1.12 vs. 1.05 kg d−1, P < 0.01) but the differences in the DS line were not significant (P > 0.05). The early calves were older at weaning and therefore were expected to have higher pre-weaning ADG. The fact that the late-born calves in the DS line equalled the early calves in pre-weaning ADG indicates that they were growing relatively faster. Late calving DS heifers had significantly higher weights (P < 0.01) at breeding in June, higher ADG to breeding, and cows had higher body condition scores at calving and weaning (P < 0.01), suggesting that DS cattle benefited more by late calving. The late-calving management system appears to be a viable option for cow-calf production in Alberta. Key words: Calving season, reproductive traits, weight and growth, beef cattle

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