نتایج جستجو برای: heifers

تعداد نتایج: 4798  

1999
M. F. QUIRK B. W. NORTON

An experiment was conducted to measure the effects of cobalt supplementation of pregnant heifers grazing pangola grass pastures on lactation and calf growth. Seven pregnant Hereford heifers were used, with three of these receiving a cobalt bullet and grinder four months after insemination. Cobalt supplementation of heifers had no effect on subsequent milk production or composition. However, cal...

Journal: :Journal of animal science 2015
A F Summers T L Meyer R N Funston

A 3-yr study was conducted to determine the effect of supplemental protein source on ADG, feed intake, calf birth BW, and subsequent pregnancy rate in pregnant beef heifers. Crossbred, Angus-based, AI-pregnant heifers (yr 1, n = 38; yr 2, n = 40; and yr 3, n = 36) were stratified by BW (450 ± 10 kg) and placed in a Calan Broadbent individual feeding system at approximately d 142 of gestation. F...

Journal: :Journal of animal science 2005
R N Funston R J Lipsey T W Geary A J Roberts

The objective of this study was to determine whether administration of hCG approximately 5 d after AI would increase plasma progesterone concentrations and conception rates in beef heifers. Heifers from two locations (Location 1: n = 347, BW = 367 +/- 1.72 kg; Location 2: n = 246, BW = 408 +/- 2.35 kg) received melengestrol acetate (0.5 mg.heifer(-1).d(-1)) for 14 d and an injection of PGF2alph...

Journal: :Journal of animal science 2001
F M Mitlöhner J L Morrow J W Dailey S C Wilson M L Galyean M F Miller J J McGlone

One hundred twelve crossbred feedlot heifers were used in two experiments to assess the impact of heat stress and its relief by shade and(or) water misting on behavior, physiology, performance, and carcass traits. Treatments were 1) no shading or misting (CONT); 2) only misting (MIST); 3) only shading (SHADE); and 4) shading plus misting (SHMI). Head in the feed bunk, head in or above the water...

2015
R. N. Funston R. J. Lipsey T. W. Geary R. P. Ansotegui R. N. FUNSTON R. J. LIPSEY T. W. GEARY

Objectives of this study were to evaluate synchronization, conception, and pregnancy rates of heifers synchronized with melengestrol acetate (MGA)-prostaglandin F2α (PGF2α,), Select Synch, or Select Synch preceded by MGA (MGA-Select Synch). Heifers in the MGA-PGF2α group (n = 209; BW = 378 kg) received MGA (0.5 mg/ d per heifer) for 14 d and PGF2α (25 mg) 19 d later. Select Synch heifers (n = 2...

Journal: :Journal of animal science 1987
M S Roberson R P Ansotegui J G Berardinelli R W Whitman M J McInerney

The objective of this study was to determine if biostimulation of prepuberal beef heifers by mature bulls would alter proportions of heifers exhibiting puberty, or age or weight at puberty. Angus (A), A X Hereford (H) and Tarentaise X HA heifers (n = 103) were stratified by age and weight within breed-type and location of birth and allotted randomly to the following treatments: 1) heifers expos...

Journal: :Journal of animal science 2006
C L Gasser C R Burke M L Mussard E J Behlke D E Grum J E Kinder M L Day

Precocious puberty can be induced in a majority of heifers weaned early and fed a high-concentrate diet. The objective of this experiment was to determine whether induction of precocious puberty is associated with an acceleration of ovarian maturation in heifers. Crossbred Angus and Simmental heifer calves were weaned at 104 +/- 2 (n = 18; early weaned) or 208 +/- 3 (n = 10; normal-weaned, NW) ...

Journal: :Journal of animal science 2013
R F Cooke D W Bohnert C L Francisco R S Marques C J Mueller D H Keisler

This experiment compared growth, body composition, plasma IGF-I and leptin, and reproductive development of beef heifers receiving or not recombinant bovine ST (BST) beginning after weaning until the first breeding season. Fifty Angus × Hereford heifers (initial BW = 219 ± 2 kg; initial age = 208 ± 2 d), weaned at approximately 6 mo of age, were assigned to the experiment (d 0 to 210). On d 0, ...

Journal: :Journal of animal science 2008
N R Leitman D C Busch J F Bader D A Mallory D J Wilson M C Lucy M R Ellersieck M F Smith D J Patterson

The objective of the experiment was to compare follicular dynamics, ovulatory response to GnRH, and synchrony of estrus and ovulation among estrous-cycling and prepubertal beef heifers synchronized with a controlled internal drug-release (CIDR)- based or GnRH-PGF(2alpha) (PG) protocol. Estrous-cycling beef heifers were randomly assigned to 1 of 4 treatments (C1, C2, C3, C4), and prepubertal bee...

2013
R. F. Cooke D. W. Bohnert C. L. Francisco R. S. Marques C. J. Mueller D. H. Keisler

This experiment compared growth, body composition, plasma IGF-I and leptin, and reproductive development of beef heifers receiving or not recombinant bovine ST (BST) beginning after weaning until the first breeding season. Fifty Angus × Hereford heifers (initial BW = 219 ± 2 kg; initial age = 208 ± 2 d), weaned at approximately 6 mo of age, were assigned to the experiment (d 0 to 210). On d 0, ...

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