Ryegrass pasture combined with partial total mixed ration reduces enteric methane emissions and maintains the performance of dairy cows during mid to late lactation
| Autor: | Henrique Mendonça Nunes Ribeiro-Filho, Aline C. Dall-Orsoletta, Jean Victor Savian, João Gabriel Rossini Almeida, Paulo César de Faccio Carvalho |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Animal feed Forage Total mixed ration Pasture Milking 03 medical and health sciences Animal science Grazing Lolium Genetics Animals Lactation Dry matter Silage geography geography.geographical_feature_category biology 0402 animal and dairy science 04 agricultural and veterinary sciences Lolium multiflorum biology.organism_classification Animal Feed 040201 dairy & animal science Diet Milk 030104 developmental biology Agronomy Cattle Female Animal Science and Zoology Methane Food Science |
| Zdroj: | Journal of Dairy Science. 99:4374-4383 |
| ISSN: | 0022-0302 |
| Popis: | The inclusion of grazed pasture in dairy feeding systems based on a total mixed ration (TMR) reduces feed costs, benefits herd health, and reduces environmental impact. The present study aimed to evaluate the effect of ryegrass pasture combined with a partial TMR on enteric methane emissions, dry matter intake (DMI), and performance of dairy cows from mid to late lactation. The experimental treatments included 100% TMR (control), partial TMR + 6h of continuous grazing (0900-1500 h), and partial TMR + 6h of grazing that was divided into 2 periods of 3h each that took place after milking (0900-1200 h; 1530-1830 h). Twelve F1 cows (Holstein × Jersey; 132±44 DIM) were divided into 6 lots and distributed in a 3×3 Latin square design with 3 periods of 21 d (15 d of adaptation and 6 d of evaluation). Ryegrass (Lolium multiflorum Lam.) pasture was used, and the TMR was composed of 80% corn silage, 18% soybean meal, and 2% mineral and vitamin mixture, based on dry matter. The same mixture was used for cows with access to pasture. The total DMI, milk production, and 4% fat-corrected milk were similar for all cows; however, the pasture DMI (7.4 vs. 6.0kg/d) and grazing period (+ 40 min/d) were higher in cows that had access to pasture for 2 periods of 3h compared with those that grazed for a continuous 6-h period. Methane emission was higher (656 vs. 547g/d) in confined cows than in those that received partial TMR + pasture. The inclusion of annual ryegrass pasture in the diet of dairy cows maintained animal performance and reduced enteric methane emissions. The percentage of grazed forage in the cows' diet increased when access to pasture was provided in 2 periods after the morning and afternoon milking. |
| Databáze: | OpenAIRE |
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