The effects of the ratio of pellets of wheat and barley grains to ground corn grain in the diet on sorting and chewing activities of heat stressed dairy cows
| Autor: | Gholam Reza Ghorbani, M. Khani, A. Zali, Hugues Guyot, S.M. Nasrollahi, A. Kahyani, Hossin Maktabi |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Veterinary medicine
Sorting (sediment) Pellets feeding behavior Body weight Zea mays heat stress Random Allocation Animal science Latin square Ground corn SF600-1100 Pellet Animals Dry matter Triticum General Veterinary Chemistry dairy cow food and beverages Hordeum Original Articles grain fermentability Animal Feed Heat stress Diet Mastication Original Article Cattle Female Heat-Shock Response |
| Zdroj: | Veterinary Medicine and Science Veterinary Medicine and Science, Vol 7, Iss 4, Pp 1409-1416 (2021) |
| ISSN: | 2053-1095 |
| Popis: | Background Normal feeding behaviours is one of the criteria of the health condition of dairy cows particularly in the condition of heat stress. Objective The study evaluated the effects of the ratio of pellets of wheat and barley grains to ground corn grain on sorting activity and chewing behaviour of lactating dairy cows managed under ambient conditions including natural heat stress events. Materials and Methods Nine multiparous cows (650 ± 56 kg Body Weight; mean ± SD) averaging 102 ± 13 days in milk and producing 54 ± 6 kg/d were randomly assigned to a triplicate 3 × 3 Latin square. During each 21‐d period, cows received one of three total mixed rations as dietary treatments. The dietary treatments were three ratio of pellets (containing 50% ground wheat and 50% ground barley): ground corn on a dry matter (DM) basis: 1) 33.3:66.6 (low); 2) 66.6:33.3 (medium); and 3) 100:0 (high). During the experiment, the ambient temperature‐humidity index was equal or more than 72, indicating that the cows were predisposed to heat stress condition. Results Increasing the proportion of wheat‐barley pellets in the diet had a minimal effect on sorting index of different particles during the first 6 h of the day. However, later in the day (6‐18h), sorting against long particles (particles >19 mm) and in favour of fine particles (particles Heat stressed dairy cows fed diets with different ratio of grains. Increasing barley and wheat grain ratio motivated cow to sort against long particles A more fluctuation in daily eating behaviour was also observed with the increasing of the grain ratio. |
| Databáze: | OpenAIRE |
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