7 to 10 mo of age (91 d;
4 pens/diet), and then were fed 1.25 kg of SB/d for an
additional 114 d (4 pens/diet). In Exp. 2, 1.25 kg of SB/
d or 1.25 kg of DDG/d was fed to 100 crossbred heifers
for 226 d, beginning at 6 mo of age (4 pens/diet). At
approximately 13 mo of age, heifers were fed melenges-trol acetate (0.5 mg/d) for 14 d, followed by an i.m.
injection of PGF2α (25 mg) 19 d later to synchronize
Key words:fertility, heifer development, protein supplement
©2008 American Society of Animal Science. All rights reserved. J. Anim. Sci. 2008. 86:476–482
doi:10.2527/jas.2007-0207
INTRODUCTION
Development of replacement heifers at growth rates
sufficient to ensure puberty before breeding is critical
1
A contribution of the University of Nebraska Agricultural Re-search Division, supported in part by funds provided through the
Hatch Act. Mention of a proprietary product does not constitute a
guarantee or warranty of the product by USDA or the authors and
does not imply its approval to the exclusion of other products that
may be also suitable.
2
The authors wish to acknowledge the financial support of the
Nebraska Soybean Board, and IVX Animal Health, St. Joseph, MO,
for donation of products.
476
estrus.
7 to 10 mo of age (91 d;
4 pens/diet), and then were fed 1.25 kg of SB/d for an
additional 114 d (4 pens/diet). In Exp. 2, 1.25 kg of SB/
d or 1.25 kg of DDG/d was fed to 100 crossbred heifers
for 226 d, beginning at 6 mo of age (4 pens/diet). At
approximately 13 mo of age, heifers were fed melenges-trol acetate (0.5 mg/d) for 14 d, followed by an i.m.
injection of PGF2α (25 mg) 19 d later to synchronize
Key words:fertility, heifer development, protein supplement
©2008 American Society of Animal Science. All rights reserved. J. Anim. Sci. 2008. 86:476–482
doi:10.2527/jas.2007-0207
INTRODUCTION
Development of replacement heifers at growth rates
sufficient to ensure puberty before breeding is critical
1
A contribution of the University of Nebraska Agricultural Re-search Division, supported in part by funds provided through the
Hatch Act. Mention of a proprietary product does not constitute a
guarantee or warranty of the product by USDA or the authors and
does not imply its approval to the exclusion of other products that
may be also suitable.
2
The authors wish to acknowledge the financial support of the
Nebraska Soybean Board, and IVX Animal Health, St. Joseph, MO,
for donation of products.
476
estrus.
การแปล กรุณารอสักครู่..