Impacts of stocking density on development and puberty attainment of replacement beef heifers

Animal : an International Journal of Animal Bioscience
K M SchubachD W Bohnert

Abstract

In all, 60 Angus×Hereford heifers were ranked by age and BW (210±2 days and 220±2 kg) on day 0, and assigned to: (a) one of three drylot pens (10×14 m pens; 10 heifers/pen) resulting in a stocking density of 14 m2/heifer (HIDENS; n=3), or (b) one of three pastures (25 ha pastures; 10 heifers/pasture), resulting in a stocking density of 25 000 m2/heifer (LOWDENS; n=3). Pastures were harvested for hay before the beginning of this experiment, and negligible forage was available for grazing to LOWDENS heifers during the experiment (days 0 to 182). All heifers received the same limited-fed diet, which averaged (dry matter basis) 4.0 kg/heifer daily of hay and 3.0 kg/heifer daily of a corn-based concentrate. Heifer shrunk BW was recorded after 16 h of feed and water withdrawal on days -3 and 183 for BW gain calculation. On day 0, heifers were fitted with a pedometer behind their right shoulder. Each week, pedometer results were recorded and blood samples were collected for puberty evaluation via plasma progesterone. Plasma samples collected on days 0, 28, 56, 84, 112, 140, 161 and 182 were also analyzed for cortisol concentrations. On days 0, 49, 98, 147 and 182, hair samples were collected from the tail switch for analysis of hair c...Continue Reading

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Citations

Jul 11, 2019·Medical Humanities·Amanda S Robinson
Sep 27, 2019·Frontiers in Veterinary Science·Graham K Barrell
May 19, 2019·Animals : an Open Access Journal From MDPI·Arvind SharmaClive J C Phillips
Jul 25, 2019·Animals : an Open Access Journal From MDPI·Peter F SuraiDarren T Juniper
Oct 18, 2020·Journal of Animal Science·Eduardo A ColomboBruno I Cappellozza
Nov 21, 2020·The Journal of Dairy Research·Urška VeselJože Starič
Jan 1, 2021·Translational Animal Science·Kelsey M SchubachBruno I Cappellozza
May 25, 2021·Animal : an International Journal of Animal Bioscience·E A ColomboV N Gouvêa

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