scholarly journals 331 Economic comparison of march and may calving systems in the nebraska sandhillls

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 131-132
Author(s):  
Devin L Broadhead ◽  
Matt Stockton ◽  
McKay Erickson ◽  
Jackie A Musgrave ◽  
Rick N Funston
Keyword(s):  
Treatment Period ◽  
Economic Model ◽  
Production System ◽  
Beef Cows ◽  
Pregnancy Rates ◽  
Net Return ◽  
Winter Range ◽  
Feed Costs ◽  
Economic Comparison

Abstract A 3-yr study evaluated the economic differences between a March and May calving production system of crossbred beef cows and their offspring from the Gudmundsen Sandhills Laboratory, Whitman, NE. Both herds were treated as a common when not in treatment period. Adjusted calf weaning BW was higher (P) for March Calves (226.4 ± 1.1 kg vs 193.4 ± 2 kg). Pregnancy rates (89% vs 91%) were similar through both systems. The stochastic economic model used for the analysis was based on 9 yr of USDA AMS data. The model accounts for most assumptions within each system, including all labor, cull and replacement cow costs and feed costs. This analysis was on the total calf costs, total pair feed costs and average market net return at weaning. March systems wintered on hay had a positive net return 2 out of the 9 yr (Average of -$88.76/calf) and on cornstalks 8 out of 9 years in Dawson County, NE (Average of $62.75/calf). March systems on winter range feed 0.41 kg DM/(cow • d) of supplement had a positive net return 4 out of the 9 yrs (Average of $25.23/calf). The May system, no matter the treatments of range or meadow and with or without supplement, had a positive net return 2 out of the 9 years (Average of $-65.77 and $-83.90/calf). Within this analysis, even with the input costs being higher for March, the net return was still greater in a March vs May system. Further analysis will be done on different trts within each system.

scholarly journals Estimation of the economic values for the important traits of Zel Sheep in the intensive production system using a bio-economic model

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Kian Pahlevan Afshari ◽  
Mehran Aboozari
Keyword(s):  
Economic Model ◽  
Production System ◽  
Live Weight ◽  
Mazandaran Province ◽  
Economic Values ◽  
Mean Values ◽  
Income Sources ◽  
Intensive Production ◽  
Important Trait ◽  
Feed Costs

To estimate economic values (EVs) of seven important traits including pregnancy rate (PR), litter size (LS), lamb weight at birth (BW0), three (weaning; BW3), six (BW6) and nine (BW9) months weight and survival rate until the age of 6 months (SR) in Zel sheep under an intensive production system in Mazandaran province of Iran, data from two farms were analysed using a bio-economic model. Variable costs accounted for about 99% of the total costs and the feed costs had the highest proportion with 72.54%. Among the income sources, the sale of surplus animals formed 81.4% of the total revenues. The EVs were estimated as the amount of change in the profit of the system after each trait mean increased by both 1% and one unit, while all other traits were constant at their mean values. The most important trait in this system was LS, followed by SR, PR, BW9, BW3, BW6 and BW0 respectively. The sensitivity of EVs was investigated by changing prices of feed and live weight of 9-month-old lambs by ±20%. Results showed that the EV of BW9 was the most constant and EV of BW0 was the most variable. As the prices of feed and live weight of 9-month-old lambs were simultaneously changed by ±20%, the variation in the EVs decreased and they showed more consistency. This study showed that the profitability in an intensive production system of Zel sheep could be increased by improving LS, SR, PR and BW9.

Response of beef heifers and non-suckling beef cows to different oestrous synchronization protocols

2002 ◽  
Vol 74 (3) ◽  
pp. 547-552 ◽  
Author(s):  
D. Cavestany ◽  
N. Negrin ◽  
R. Negrin ◽  
J. F. Groth
Keyword(s):  
Beef Cattle ◽  
Medroxyprogesterone Acetate ◽  
Artificial Insemination ◽  
Experimental Period ◽  
Fixed Time ◽  
Beef Cows ◽  
Pregnancy Rates ◽  
Gnrh Analogue ◽  
Beef Heifers

AbstractThe objective was to evaluate different oestrous synchronization schemes in beef cattle under range conditions. In experiment 1, 202 heifers averaging 26 months of age were assigned randomly to three treatments: (a) GnRH-PG. (no. = 44) day 0 (D0): injection of GnRH; D7: injection of PGF2α; D0 to D25 oestrous detection (OD) and artificial insemination (AI); (b) OD-PG. (no. = 45) D0 to D4; OD + AI; D5: injection of PGF2α; D5 to D25 OD + AI; and (c)Ovsynch. (no. = 113) D0: injection of GnRH; D7: injection of PGF2α; D9: injection of GnRH and 16 h later AI at fixed time. In experiment 2, 318 non-suckling cows were assigned randomly to three treatments: (a) GnRH-PG. (no. = 106) D0: injection of GnRH; D7: injection of PGF2α; D0 to D25 OD + AI; (b) GnRH-MAP-PG. (no. = 106) D0: injection of a GnRH analogue and insertion of an intravaginal sponge impregnated with 250 mg of medroxyprogesterone acetate; D7: injection of PGF2α and sponge withdrawal; D0 to D25 OD + AI; (c) controls. (no. = 106) OD and AI. The experimental period lasted 25 days and, with exception of the Ovsynch treatment, oestrous detection was carried out twice a day (a.m./p.m.) and inseminations performed 12 h later. The pregnancy rates assessed by ultrasonography 30 days after AI were: experiment 1: (a) 30·0%; (b) 28·6% and (c) 62·3% (P < 0·05); experiment 2: (a) 60·2%; (b) 57·8% and (c) 45·5% (P < 0·05). It is concluded that in heifers and non-suckling cows, oestrous synchronization treatments result in higher pregnancy rates. In non-suckling cows, the addition of a progestagen did not improve the response.

Insemination timing affects pregnancy rates in beef cows treated with CO-Synch protocol including an intravaginal progesterone insert

2009 ◽  
Vol 72 (7) ◽  
pp. 1009-1016 ◽  
Author(s):  
C.A. Dobbins ◽  
D.R. Eborn ◽  
D.E. Tenhouse ◽  
R.M. Breiner ◽  
S.K. Johnson ◽  
...  
Keyword(s):  
Beef Cows ◽  
Pregnancy Rates

scholarly journals Cubed Alfalfa Hay or Cottonseed Meal-Barley as Supplements for Beef Cows Grazing Fall-Winter Range

1986 ◽  
Vol 39 (4) ◽  
pp. 361 ◽  
Author(s):  
R. C. Cochran ◽  
D. C. Adams ◽  
P. O. Currie ◽  
B. W. Knapp
Keyword(s):  
Cottonseed Meal ◽  
Beef Cows ◽  
Winter Range ◽  
Alfalfa Hay

scholarly journals Calving sub-season and reproductive efficiency of beef cows

2010 ◽  
Vol 39 (10) ◽  
pp. 2182-2186
Author(s):  
Cristiane Reinher ◽  
Júlio Otávio Jardim Barcellos ◽  
Vanessa Peripolli ◽  
Ênio Rosa Prates ◽  
Maria Eugênia Andrighetto Canozzi
Keyword(s):  
Pregnancy Rate ◽  
Beef Cows ◽  
Pregnancy Rates ◽  
Reproductive Efficiency ◽  
Climate Variations ◽  
Southern Brazil ◽  
Chi Square ◽  
Chi Square Test

It was evaluated in this work the effect of calving sub-season on the pregnancy rate of 7,726 multiparous Hereford beef cows grazing on natural pastures in southern Brazil, from 1994 to 2007. Calving sub-season periods were divided in 20-day intervals from August 12th to 31st; from September 1st to 20th; from September 21st to October 10th; from October 11th to 31st; from November 1st to 20th. Calving in each sub-season and pregnancy rate (PR) were analyzed by the Chi-square test. Overall means of each sub-season were 92.7% (from August 12th to 31st), 90.6% (from September 1st to 20th), 82.1% (from September 21st to October 10th), 77.7% (from October 11th to 31st), and 70.6% (from November 1st to 20th). Calving sub-season significantly influenced pregnancy rate. Cows which calved in the initial sub-season showed higher pregnancy rates than cows which calved from the fourth calving sub-season. However this difference did not occur in 1999 and in 2007 since calving rates did not statistically differ among the five sub-seasons. In 1998 and 2004, calving rates were lower and the effects of calving sub-season on pregnancy rates were higher, possibly due to climate variations. In general, pregnancy rate decreases as calving occurs later in the year, particularly in years when the weather adversely affects pasture growth.

Pregnancy rates of postpartum beef cows that were synchronized using Syncro-Mate-B or the Ovsynch protocol.

1998 ◽  
Vol 76 (6) ◽  
pp. 1523 ◽  
Author(s):  
T W Geary ◽  
J C Whittier ◽  
E R Downing ◽  
D G LeFever ◽  
R W Silcox ◽  
...  
Keyword(s):  
Beef Cows ◽  
Pregnancy Rates

Parenteral Zinc Supplementation Increases Pregnancy Rates in Beef Cows

2019 ◽  
Vol 192 (2) ◽  
pp. 175-182
Author(s):  
J. M. Anchordoquy ◽  
J. P. Anchordoquy ◽  
E. M. Galarza ◽  
N. A. Farnetano ◽  
M. J. Giuliodori ◽  
...  
Keyword(s):  
Zinc Supplementation ◽  
Beef Cows ◽  
Pregnancy Rates

The effects of restricting concentrate intake on january born lambs at grass

1995 ◽  
Vol 1995 ◽  
pp. 72-72 ◽  
Author(s):  
T. Coll ◽  
P. J. Quinn ◽  
T.F. Crosby
Keyword(s):  
Production System ◽  
Farm Product ◽  
Ad Libitum ◽  
Costs Of Production ◽  
Feed Costs

In an early lamb production system feed costs and age at slaughter are big factors in determining profit. Farmers are being forced to become more efficient producers as costs of production continue to rise and farm product prices fail to keep pace with inflation. The aim of this experiment was to evaluate the performance of lambs fed concentrates ad-libitum to those fed to a maximum restricted level of 0·5 kg/hd/day.

scholarly journals 380 Effects of estradiol benzoate on reproductive characteristics in beef cows

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 145-145
Author(s):  
Lacey M Dysart ◽  
Caleb O Lemley ◽  
Riley Messman ◽  
Jamie E Larson
Keyword(s):  
Doppler Ultrasonography ◽  
Blood Perfusion ◽  
Beef Cows ◽  
Estradiol Benzoate ◽  
Pregnancy Rates ◽  
The Other ◽  
Control Group ◽  
Blood Samples ◽  
Doppler Probe ◽  
Imagej Software

Abstract Ovulation prompted by exogenous GnRH may cause the release of sub-mature oocytes and lead to decreased pregnancy rates. Inclusion of estradiol benzoate (EB) has improved pregnancy rates. The objective was to determine if EB affects blood perfusion of follicles, CL, or uterus, concentrations of estradiol, or incidence of standing estrus. Forty-seven suckled beef cows were synchronized (GnRH+CIDR on d -9, PGF2a+CIDR removal on d -2, expected estrus=d 0). On d -1, 24 of 47 cows received an injection of EB (1mg/2mL) while the other 23 remained as a control group. Ovaries were evaluated via Doppler ultrasonography on d -1, 0, 6, 14, and 21. A laser Doppler probe was used to measure blood perfusion of the uterus on d -1, 0, and 6. Only cows that exhibited estrus (n = 29) were evaluated on d 14 and 21. Images were analyzed via ImageJ software to determine mean area of perfusion. Blood samples were collected on d -1 and 0 and analyzed for concentrations of estradiol using RIA. Using SAS, MIXED and FREQ were used to determine the influence of treatment on blood perfusion and estradiol, and incidence of standing estrus, respectively. Treatment with EB increased (P &lt; 0.001) the number of cows exhibiting standing estrus compared to control (21/24 vs 8/23, respectively). Treatment of EB did not (P &gt; 0.10) alter blood perfusion of the follicles or uterus on any day or perfusion of the CL on d 6. However, EB increased (P &lt; 0.036) the size of the CL on d 14 (25.06±1.7 vs 6.06±3.7) and tended (P &lt; 0.097) to increase the size of the CL on d 21. Treatment of EB increased (P &lt; 0.003) concentrations of estradiol on d 0 compared to control (21.35±4.49 vs 9.44±4.61 pg/mL). In conclusion, treatment with EB may play a role in changing the CL after ovulation.

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