Stockpiled 'Tifton 85' bermudagrass for cow-calf production as influenced by nitrogen fertilization1
| Autor: | Brian E. Gamble, L. A. Kriese-Anderson, C. M. Holland, Kaleb B. Marchant, Russell B. Muntifering |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
geography geography.geographical_feature_category 0402 animal and dairy science Forage 04 agricultural and veterinary sciences General Medicine Cow-calf Biology 040201 dairy & animal science 01 natural sciences Pasture Cottonseed Animal science Human fertilization Grazing Genetics Hay Animal Science and Zoology Tifton 010606 plant biology & botany Food Science |
| Zdroj: | Journal of Animal Science. 96:2907-2922 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.1093/jas/sky190 |
| Popis: | A 2-yr study was conducted to determine the effects of rate of N fertilization on productivity and nutritive value of stockpiled "Tifton 85" bermudagrass for lactating-cow and calf performance. On 31 October 2012 (year 1) and 11 November 2013 (year 2), 16 Angus × Simmental cows (mean initial BW for both years, 647 ± 23 kg) and their calves (mean age for both years, 16 ± 3 d) were assigned randomly to 0.76-ha paddocks (2 cow-calf pairs/paddock) of stockpiled "Tifton 85" bermudagrass pasture that had been cut to a 10-cm stubble height in early August and fertilized with either 56 (56N), 112 (112N), or 168 (168N) kg N/ha (2 paddocks/treatment), or to replicate 0.41-ha paddocks (2 cow-calf pairs/paddock) of dormant pasture with free-choice access to August-cut "Tifton 85" bermudagrass hay plus 2.7 kg whole cottonseed daily (HAY). Cows were allowed access to strips of ungrazed forage by moving polytape every 3 to 4 d to maintain a DM harvest efficiency of approximately 75%. In year 1, forage mass (6,113 kg DM/ha), IVDMD (60.9%), and grazing d/ha (314) were not different (P > 0.05) among the stockpile treatments over a 116-d grazing period; mean forage IVDMD (60.1%) and CP (12.7%) in the stockpiled treatments were greater (P 0.05) among treatments. Mean blood urea-N (BUN) concentrations (11.2 mg/mL) were not different among treatments, but mean BUN across treatments for the last sampling date was greater (P < 0.05) than the first and second sampling dates. Mean 205-d adjusted weaning weight (249 kg ± SD) was not different among treatments. Economic evaluation revealed that input costs/cow were 66%, 61%, and 56% greater for HAY than 56N, 112N, and 168N, respectively. Stockpiled forages were of sufficient nutritive quality to support lactation without supplementation. |
| Databáze: | OpenAIRE |
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