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Showing 1 to 20 of 65 for “"beef cows"”.
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Determining the Nutritional Status of Mature Beef Cows
… may enhance the nutritional management of beef cows. In two 12 mo trials, mature beef cows (n=136) grazing tall fescue pastures were used to compare estimates of forage quality and animal performance. Forage quality was estimated by proximate analysis of forage samples (FOR) or by near …
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EFFECTS OF A PROTECTED FAT SUPPLEMENT ON THE GNRH INDUCED LH RELEASE IN EARLY POSTPARTUM BEEF COWS AND OVARIECTOMIZED BEEF COWS
… In the first trial eight ovariectomized brangus cows were used to study the effect of feeding a protected-fat supplement on LH release after GnRH injection. The cows were equally divided at random into two groups (control and treatment), placed in individual pens, and fed a ration supplying 4.0 …
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Factors Affecting the Voluntary Feed Intake of Beef Cows
Made available in DSpace on 2014-12-13T19:42:46Z (GMT). No. of bitstreams: 1 7820924.pdf: 2160643 bytes, checksum: a776d8dd82c08481d5d8d8dc9efecd2a (MD5) Previous issue date: 1978
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Simulation of genetic control of reproduction in beef cows
… based on 5 yr of records on 100 herds of 50 cows each. Realized heritabilities (RUN1-RUN4) for BCR, FSCR, FS, NS, CD, PPI, ACTWW and ADJWW ranged from .165-.028, .187-.055, .023-.010, .227-.071, .071-.032, .158-.022, .148-.176 and .156-.203, respectively. Repeatability estimates (RUN1- RUN4) …
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Impact of grazing stockpiled tall fescue of lactating beef cows
Two experiments are described, in which fall-calving cow-calf pairs grazed stockpiled tall fescue at three different endophyte infection levels (20, 51, and 89%) and four forage allowances (2.25, 3.00, 3.75, and 4.50% of BW). A hay feeding treatment was included as a standard for comparison. Each …
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Program Feeding Strategies for Reducing Costs of Wintering Beef Cows
… to evaluate program-fed diets for maintaining beef cows. The largest expense in a cow/calf production system is the cost associated with maintaining the producing cow through the winter months. This research focused on evaluating the performance, financial, and environmental impacts of using …
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Nutritional status of beef cows grazing reclaimed strip mined pastures
… conducted to evaluate the nutritional status of beef cows grazing reclaimed strip-mined pastures in southwestern, Virginia. Blood samples, esophageal fistula forage samples and hand plucked forage samples were taken in each trial. An external marker, Ytterbium, and an internal marker, …
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Consumption of Endophyte Infected Fescue During Gestation in Beef Cows
… also adversely affects cattle production. Cows consuming the ergot alkaloids produced by these endophytes can exhibit decreased feed intake, growth performance, organ vasoconstriction, and increased rectal temperature. This work is interested in examining how endophyte toxin exposure …
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Methods to enhance embryo quality and recovery rates in superovulated beef cows
… quality and recovery rates in superovulated beef cows were investigated. In the first study, uteri from superovulated heifers on day of recovery were harvested immediately following exsanguination and sectioned into 3 segments per horn plus the oviduct (8 sections per total uterus). Each …
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Effect of concentrations of progesterone on follicular development and fertility in beef cows
… of progesterone on fertility in lactating beef cattle. Cows on the low ascending progesterone treatment received PGF2alpha from days 3 to 4 after estrus. All cows received PGF2alpha on day 9, and estradiol benzoate on day 11. Cows were inseminated artificially 12 hours after estrus. …
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Effects of Preovulatory Estradiol Concentration on Embryo Survival and Pregnancy Establishment in Beef Cows
… establishment and maintenance of pregnancy in beef cows. The mechanism by which estradiol affects pregnancy establishment and maintenance has not been well characterized. Previous studies have examined the effects of preovulatory estradiol exposure when mediated through ovulatory follicle size …
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Evaluation of Rotational Bale Grazing as an Alternative Winter-Hay Feeding System for Beef Cows
Traditional methods of winter hay feeding for beef cattle often entail numerous challenges, including high labor demands, high fuel consumption, soil compaction, limited nutrient dispersion, heightened nutrient runoff risks, low forage yields, and nitrogen loss from manure. Rotational bale grazing …
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Evaluation of long-term CIDR-based estrus synchronization protocols in primiparous two-year-old beef cows
Reproductive management of two-year-old beef cows presents a unique challenge in managing a beef herd, since this age group of females typically experiences the highest incidence of reproductive failure. Strategic management of replacement beef heifers and primiparous cows is necessary to ensure …
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Effect of feeding high levels of broiler litter on mineral metabolism and health of beef cows
… have reported metabolic disturbances in beef cows fed high levels of broiler litter. Therefore, an experiment was conducted to evaluate mineral metabolism of beef cows fed different levels of broiler litter. Sixty Angus-Hereford crossbred cows ranging in age from 3 to 12 yr were blocked …
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Effects of fescue cultivar on performance of beef cows grazed on summer stockpiled tall fescue pastures
… pastures and the performance of fall-calving beef cow/calf pairs stocked on each cultivar. Fescue cultivars used were KY-31 and MaxQ for E+ and NE treatments, respectively. Pregnant Simmental x Angus cows (128 total, 64 each yr) were stratified by BW, BCS, and expected calving date and then …
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Metabolic, reproductive, and performance evaluation in primiparous Nellore beef cows under grazing with different ages at breeding
… performance differences of primiparous Nellore cows, which became pregnant at 14 or 24 months. Thirty- eight primiparous Nellore cows with 200 ± 30 days of gestation were used, divided into two treatments: 14 - animals that became pregnant at 14 months of age, and 24 - animals that became …
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Effects of energy-protein supplementation frequency on performance of primiparous grazing beef cows during pre and postpartum
… postpartum (105 d after calving) of primiparous beef cows on performance and metabolic characteristics under grazing conditions. Twenty-four pregnant Nellore primiparous cows with average BW of 409±8.0 kg, 22±0.9 mo old and 172±2.5 d of gestation were used in this trial. Treatments were randomly …
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Factors That Enhance Pituitary and Ovarian Functions in Postpartum Beef Cows (Naloxane, Gn-Rh, Pgf(2), Indomethacin)
… years ahead of it becomes ideal that each beef cow should produce one calf every year in order to sustain an economically viable cow-calf operation. In actual farm settings, however, this ideal condition is seldom achieved because of a variety of factors that act singly or in combination …
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Changes in vaginal microbiome of beef cows enrolled in estrous synchronization protocols and its relation to fertility
… (ES) is a valuable technology that can help beef cow-calf producers to overcome infertility caused by prolonged anestrus. Protocols for ES that use progesterone (P4) supplementation are of particular value to cows with prolonged postpartum anestrus as P4 triggers them to begin cycling and …
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