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Kansas Agricultural Experiment Station Research Reports | 1981

Effect of limited sucklingon reproductive performance and milk production of cowsand weight gains and suckling behavior of calves

Kenneth G. Odde; G.H. Kiracofe; R.R. Schalles

We used 109 Polled Hereford and percentage Simmental cows to evaluate limited suckling as an aid to induce cows to cycle after calving. Cows were allotted to: 1. once daily suckle; 2. twice daily suckle; 3. 48 hr calf removal (just before breeding season); and 4. controls (suckle ad libitum). Half of each group was implanted with Norgestomet 9 days before the breeding season. Limited suckling increased the number of cows showing estrus and conceiving early in the breeding season, and Norgestomet increased the percentage pregnant the first 21 days of the breeding season.


Kansas Agricultural Experiment Station Research Reports | 1978

Effect of age and type of testosterone treatment on cows used for heat detection

G.N. Laaser; G.H. Kiracofe; Heekin; H.S. Ward; Kenneth G. Odde

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1978 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.


Kansas Agricultural Experiment Station Research Reports | 1983

Management options for pregnant feedlot heifers

M. Simon; L.E. Keay; G.H. Kiracofe; Jack G. Riley

Heifers that were 167 days pregnant when slaughtered gained faster and more efficiently than open heifers, or heifers that had been aborted with a prostaglandin analog at 83 or 138 days, unless the slaughter weight was adjusted for the 1.7% lower carcass yield (dressing %). When the slaughter weights for all these management options were adjusted using the carcass yield of open heifers, there was no difference in gain except for the depressed performance associated with late abortions. However, open heifers were 6.7% more efficient than heifers pregnant when slaughtered. Heifers aborted at 138 days had substantially reduced gains and feed conversion. These results indicate that because of increased carcass yield, packers can afford to pay a premium for heifers that are open or have been aborted during the first trimester. Unless a premium is paid for open heifers, pregnant heifers (provided they are sold before calving) sold on a live weight basis might be more profitable because of the apparent increased gain and efficiency.


Kansas Agricultural Experiment Station Research Reports | 1991

Follicular development and reproductive hormone changes during postpartum anestrusin suckled beef cows

R.C. Perry; L.R. Corah; W.E. Beal; G.H. Kiracofe; J. Ernest Minton; R.C. Cochran; J.R. Brethour; Jeffrey S. Stevenson

Twenty-six, Hereford x Angus, suckled cows were utilized to determine patterns of follicular development and associated changes in reproductive hormones during postpartum anestrus and first estrous cycles. Ultrasonography per rectum was used to monitor follicular size and detect ovulation. Dietary energy and(or) body condition influenced patterns of follicular development during postpartum anestrus. Follicular growth occurred in waves during this period in cows that were in adequate body condition and adequately fed, and follicular development appeared to be related to serum concentrations of luteinizing hormone and estradiol. Two distinct characteristics were associated with follicular development before the first postpartum ovulation. First, diameter of dominant follicles increased with successive follicular waves. Second, a large dominant follicle was present for an extended time before development of the first ovulatory follicle and appeared to be involved in the mechanism that initiates the first ovulation after calving.


Kansas Agricultural Experiment Station Research Reports | 1991

Dehydrated alfalfa pellets and soybean meal/grain sorghum in step-up winter supplementation programs for spring-calving beef cows

E.S. Vanzant; R.C. Cochran; L.R. Corah; G.H. Kiracofe

The performance response to a stepwise increase in the level of supplement fed to cows across the winter supplementation period was studied by feeding 112 Hereford x Angus cows the following treatments: dehydrated alfalfa pellets (DEHY) or soybean meal/grain sorghum (SS), each either level-fed (constant daily amount from December 1 to calving) or fed in a step-up program (low level from December 1 to 30; moderate level from December 31 to January 29; high level from January 30 to calving; avg = amount fed with level-feeding). Cow weight and condition changes and calf performance were favored by the step-up supplementation program when SS was fed. When DEHY was fed, cow weight and condition changes favored level-feeding. Weight and condition changes generally favored the DEHY group over the SS group. No effects were found for the reproductive characteristics measured. These results indicate that potential benefits of step-up winter supplementation programs depend on the type of supplement being fed. All of the supplementation programs appeared adequate to support desirable levels of reproductive performance.


Kansas Agricultural Experiment Station Research Reports | 1990

Effects of rumen-escape lipid in a range supplement on postpartum reproductive function in beef cows

R.B. Hightshoe; R.C. Cochran; L.R. Corah; D.L. Harmon; G.H. Kiracofe

Postpartum cows receiving a range supplement containing rumen-escape lipid exhibited altered hormone and cholesterol levels compared to cows not fed lipid. Sixty-seven percent of lipid-fed cows exhibited a normal (18.2 d) first estrous cycle vs 33% for cows not receiving lipid. Incorporation of rumen-escape lipid into range supplements appears to significantly improve postpartum reproductive characteristics.


Kansas Agricultural Experiment Station Research Reports | 1981

Effects of weaning weight on reproductive performance in beef heifers

L.R. Sprott; L.R. Corah; G.H. Kiracofe

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1981 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.


Kansas Agricultural Experiment Station Research Reports | 1981

The effects of Rumensin® and two levels of energy prior to calving on reproductive performance in first calf heifers

L.R. Sprott; L.R. Corah; Jack G. Riley; G.H. Kiracofe

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1981 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.


Kansas Agricultural Experiment Station Research Reports | 1980

The effects of Rumensin, protein, energy, and post-weaningillness on reproductive performance in replacement heifers

L.R. Sprott; G.H. Kiracofe; L.R. Corah; Jack G. Riley

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1980 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.


Kansas Agricultural Experiment Station Research Reports | 1979

Pelvic area, calving ease and rebreeding in first calf heifers

R.R. Schalles; A.T. Fleck; L.R. Corah; G.H. Kiracofe

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1979 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

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Jack G. Riley

Western Illinois University

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L.R. Corah

Kansas State University

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R.C. Cochran

Kansas State University

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M. E. King

Kansas State University

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R.E. Stewart

Kansas State University

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