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Browsing by Author "Lamb, G.C."

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Effect of heifer source on reproductive performance, culling, marketing and profitability for a commercial heifer development program

Lynch, J.M.; Lamb, G.C.; Grieger, D.M.; Corah, L.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1997)

A commercial heifer development operation purchased 483 weanling Angus × Hereford heifers from 11 sources. Heifers were fed a common silage-based diet through an initial developmental period and retained or culled based ...
Estrus detection, first service conception, and embryonic death in beef heifers synchronized with MGA and prostaglandin

Lamb, G.C.; Miller, B.L.; Traffas, V.; Corah, L.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1997)

In April, 1996, 1501 yearling crossbred heifers located on seven different ranches were estrus-synchronized and artificially inseminated (AI) 12 hours after they were detected in estrus. Herd size ranged from 82 to 43 ...
Estrus synchronization of replacement beef heifers by using GnRH, prostaglandin F2α (PGF), and progesterone (CIDR): a multi-location study

Larson, J.E.; Lamb, G.C.; Geary, T.W.; Stevenson, J.S.; Johnson, S.K.; Day, M.L.; Kesler, D.J.; DeJarnette, J.M.; Landblom, D.G.; Whittier, D. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2004)

Our objectives were to determine whether a fixed-timed artificial insemination (TAI) protocol could yield similar fertility rates to a protocol requiring detection of estrus and whether an injection of gonadotropin ...
Estrus synchronization of suckled beef cows by using GnRH, prostaglandin F2α (PGF), and progesterone (CIDR): a multi-location study

Larson, J.E.; Lamb, G.C.; Stevenson, J.S.; Marston, T.W.; Johnson, S.K.; Day, M.L.; Geary, T.W.; Kesler, D.J.; DeJarnette, J.M.; Schrick, F.N.; Areseneau, J.D. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2004)

Our objectives were to determine whether a fixed-time artificial insemination (TAI) protocol could yield pregnancy rates similar to a protocol requiring detection of estrus and whether inclusion of a CIDR (a vaginal insert ...
Evaluation of human chorionic gonadotropin as a replacement for GnRH in an ovulation synchronization protocol before fixed-time insemination

Burns, M.G.; Buttrey, B.S.; Eborn, D.R.; Larson, J.E.; Lovaas, B.J.; Lamb, G.C.; Olson, K.C.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2007)

Two experiments were conducted to evaluate the difference between gonadotropinreleasing hormone (GnRH) and human chorionic gonadotropin (hCG) given at the beginning of a timed AI protocol and their effects on fertility. ...
Evaluation of the 5- vs. 7-day CIDR program in dairy heifers before timed artificial insemination

Mellieon, H.I. Jr.; Pulley, S.L.; Lamb, G.C.; Larson, J.E.; Stevenson, J.S. (Kansas Agricultural Experiment Station and Cooperative Extension Service, 2011)

Our objectives were to determine: (1) the effectiveness of an injection of PGF2α to regress the corpus luteum before initiating an timed artificial insemination (TAI) program, (2) ovulation response to gonadotropin-releasing ...
Fertility after timed breeding using GnRH, PGF2, and norgestomet

Thompson, K.E.; Stevenson, J.S.; Grieger, D.M.; Lamb, G.C.; Marple, T.J.; Corah, L.R.; Nichols, D.A.; McKee, R.M. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1997)

At the KSU Purebred Unit, 164 purebred Angus, Hereford, and Simmental cows were used to test a new estrus-synchronization program using GnRH, PGF2, and norgestomet. Cows were inseminated after detected estrus, or in ...
Fixed-time insemination of suckled beef cows. 1. select synch, cosynch, and their combination

Stevenson, J.S.; Thompson, K.E.; Lamb, G.C.; Grieger, D.M. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1999)

As in our previous studies, the GnRH + PGF2" treatment was very effective in inducing a fertile estrus and(or) ovulation. Ovulations induced in response to the first GnRH injection averaged 48% in three herds and ranged ...
Fixed-time inseminaton of suckled beef cows. 2. Cosynch and progesterone

Stevenson, J.S.; Lamb, G.C.; Cartmill, J.A.; Hensley, B.A.; Marple, T.J. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1999)

The Cosynch protocol (GnRH 7 days before and again 48 h after PGF2" with AI at the second GnRH injection) produced pregnancy rates in suckled beef cows that exceeded 50% without heat detection and with only three handlings ...
Hormonal and behavioral characteristics associated with the onset of radiotelemetric-detected estrus

Stevenson, J.S.; Lamb, G.C.; Hoffman, D.P.; Kobayashi, Y. (Kansas Agricultural Experiment Station, 1996)

The objective of this study was to examine changes in ovarian steroids in relation to the onset of first standing estrus detected by pressure-sensitive rump-mounted devices (ABS HeatWatch® [HW]). Twenty Holstein ...
Increasing interval to prostaglandin from 17 days to 19 days in an MGA-prostaglandin synchronization system for heifers

Nix, D.W.; Lamb, G.C.; Traffas, V.; Corah, L.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1998)

Weanling Angus × Hereford heifers were purchased by a commercial heifer development operation from 12 sources. Heifers were fed a silage-based diet through an initial developmental period and then were retained or ...
Influence of timing and rate of gain on puberty and reproductive performance of beef heifers

Smith, J.M.; Lamb, G.C.; Minton, J.E.; Brandt, R.T. Jr.; Cochran, R.C. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1995)

Seventy-seven crossbred heifers (573 lb initial body weight) were developed in drylot and limit-fed a corn, sorghum silage diet predicted to produce gains of either 1 lb/day for the entire developmental period (EVENGAIN) ...
Milking twice daily in the presence of a cow’s own calf fails to prolong postpartum anestrus

Lamb, G.C.; Lynch, J.M.; Miller, B.L.; Grieger, D.M.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1997)

Six treatment s were initiated approximately 15 days after calving: 1) calf was weaned permanently from its dam (calf weaned; CW); 2) calf was present continuously with its dam but contact with the udder was prohibited ...
Milking two or five times daily in the presence of a cow’s own nonsuckling calf fails to prolong postpartum anovulation

Lamb, G.C.; Thompson, K.E.; Heldt, J.S.; Löest, C.A.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1998)

Three treatments were initiated at approximately 15 days after calving and continued for 4 weeks: 1) cows were suckled ad libitum by their calves (calf present [CP]); 2) calves were present but nonsuckling 24 hr/day and ...
A novel estrus-synchronization program for anestrous and cycling, suckled, beef cows

Forbes, W.L.; Corah, L.R.; Grieger, D.M.; Thompson, K.E.; Lamb, G.C.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1997)

We used four herds at three Kansas ranches to evaluate the potential of two new estrus synchronization strategies to increase estrus expression and fertility of 911 crossbred suckled beef cows. The treatments included: ...
Observations with heatwatch to detect estrus by radiotelemetry in cattle

Stevenson, J.S.; Smith, M.W.; Hoffman, D.P; Lamb, G.C.; Kobayashi, Y. (Kansas Agricultural Experiment Station, 1995)

In Experiment 1, the effectiveness of two estrus-detection methods (visual observation vs radiotelemetric, pressure-sensitive, rumpmounted devices [HeatWatch®]) were compared in heifers. A pressure sensitive ...
Ovulation synchronization with progestins prior to a Cosynch protocol in beef cows

Stevenson, J.S.; Medina-Britos, M.A.; Richardson, A.M.; Lamb, G.C.; Hensley, B.A.; Marple, T.J.; Johnson, S.J. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2001)

A multi-location study was conducted using suckled beef cows in Minnesota and Kansas to test the benefit of adding a source of progestin to the Cosynch ovulation synchronization protocol (injections of GnRH, 7 days ...
Pregnancy rates in MGA-prostaglandin synchronized heifers bred at estrus or inseminated at fixed times

Smith, J.M.; Corah, L.R.; Lamb, G.C.; Spell, A.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1995)

The objective of this project was to study the effects on pregnancy rates of inseminating estrus-synchronize d heifers either at observed estrus or at a fixed time. In April, 1994, 574 yearling crossbred heifers, located ...
Presynchronizing PGF2α and GnRH injections before timed artificial insemination CO-Synch + CIDR program

Hill, S.L.; Pulley, S.L.; Olson, KC; Jaeger, J.R.; Breiner, R.A.; Lamb, G.C.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2013)

Fixed-time artificial insemination is an effective management tool that reduces the labor associated with more conventional artificial insemination programs requiring detection of estrus. The 7-day CO-Synch + controlled ...
Presynchronizing Prostaglandin F2α injection before timed artificial insemination CO-Synch + CIDR program

Hill, S.L.; Pulley, S.L.; Mellieon, H.I. Jr.; Olson, KC; Jaeger, J.R.; Breiner, R.A.; Perry, G.A.; Lamb, G.C.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2012)

Fixed-time artificial insemination is an effective management tool that reduces the labor associated with more conventional programs that require detection of estrus. The 7-day CO-Synch + controlled internal drug release ...

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