Effects of group-size-floor space allowance during the nursery phase of production on growth, physiology, and hematology in replacement gilts1
| Autor: | Merlin D Lindemann, Stuart R Callahan, Mark J. Estienne, Ashley DeDecker, A. J. Cross |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
medicine.medical_specialty
Hematology 040301 veterinary sciences 0402 animal and dairy science Blood count Physiology Allowance (money) Red blood cell distribution width Single group 04 agricultural and veterinary sciences General Medicine Biology 040201 dairy & animal science 0403 veterinary science Blood chemistry Internal medicine Genetics medicine Weaning Animal Science and Zoology Blood parameters Food Science |
| Zdroj: | Journal of Animal Science. 95:201-211 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.2527/jas.2016.0842 |
| Popis: | The objective was to determine effects of nursery group-size-floor space allowance on growth, physiology, and hematology of replacement gilts. A 3 × 3 factorial arrangement of treatments was used wherein gilts classified as large, medium, or small ( = 2537; BW = 5.6 ± 0.6 kg) from 13 groups of weaned pigs were placed in pens of 14, 11, or 8 pigs resulting in floor space allowances of 0.15, 0.19, or 0.27 m/pig, respectively. Pigs were weighed on d 0 (weaning) and d 46 (exit from nursery). The ADG was affected by group-size-floor space allowance × pig size ( = 0.04). Large- and medium-size gilts allowed the most floor space had greater ( 0.05) of group size-floor space allowance. Mortality in the nursery was not affected ( > 0.05) by treatment, size, or treatment × size and overall was approximately 2.1%. Complete blood counts and blood chemistry analyses were performed on samples collected at d 6 and 43 from a subsample of gilts ( = 18/group-size-floor space allowance) within a single group. The concentration ( < 0.01) and percentage ( = 0.03) of reticulocytes was the least and red blood cell distribution width the greatest ( < 0.01) in gilts allowed 0.15 m floor space (effects of treatment). Blood calcium was affected by treatment ( = 0.02) and concentrations for gilts allowed the greatest and intermediate amounts of floor space were greater ( < 0.05) than for gilts allowed the least floor space. Serum concentrations of cortisol were not affected by treatment × day ( = 0.27). Cortisol concentrations increased from d 6 to d 43 in all groups and were affected by day ( < 0.01) but not treatment ( = 0.53). Greater space allowance achieved by placing fewer pigs per pen in the nursery affected blood parameters and resulted in large- and medium-size replacement gilts displaying increased ADG. Further study will determine if these effects influence lifetime reproductive capacity and sow longevity. |
| Databáze: | OpenAIRE |
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