دورية أكاديمية
Intake, performance, and feeding behavior of Holstein and Holstein × Gyr heifers grazing intensively managed tropical grasses during the rainy season.
| العنوان: | Intake, performance, and feeding behavior of Holstein and Holstein × Gyr heifers grazing intensively managed tropical grasses during the rainy season. |
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| المؤلفون: | Quirino DF; Department of Animal Science, Universidade Federal de Viçosa, 36570-000 Viçosa, Minas Gerais, Brasil., Marcondes MI; Department of Animal Sciences, Washington State University, 99164 Pullman, Washington, USA. Electronic address: marcos.marcondes@wsu.edu., Rennó LN; Department of Animal Science, Universidade Federal de Viçosa, 36570-000 Viçosa, Minas Gerais, Brasil., Correa PVF; Department of Veterinary Medicine, Universidade Federal de Viçosa, 36570-977 Viçosa, Minas Gerais, Brazil., Morais VCL; Department of Animal Science, Universidade Federal de Viçosa, 36570-000 Viçosa, Minas Gerais, Brasil., Cunha CS; School of Veterinary Medicine and Animal Science, Universidade Federal de Mato Grosso do Sul, 79, Campo Grande, Mato Grosso do Sul, Brazil., Silva TDA; Department of Veterinary Medicine, Universidade Federal de Viçosa, 36570-977 Viçosa, Minas Gerais, Brazil., da Silva AL; Department of Animal Science, Universidade Federal de Viçosa, 36570-000 Viçosa, Minas Gerais, Brasil., Miller-Cushon E; Department of Animal Sciences, University of Florida, 32611 Gainesville, FL, USA., Rotta PP; Department of Animal Science, Universidade Federal de Viçosa, 36570-000 Viçosa, Minas Gerais, Brasil. |
| المصدر: | Animal : an international journal of animal bioscience [Animal] 2022 Sep; Vol. 16 (9), pp. 100613. Date of Electronic Publication: 2022 Aug 12. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Elsevier Country of Publication: England NLM ID: 101303270 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1751-732X (Electronic) Linking ISSN: 17517311 NLM ISO Abbreviation: Animal Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: 2021- : [London] : Elsevier Original Publication: Cambridge, England : Cambridge University Press |
| مواضيع طبية MeSH: | Animal Feed*/analysis , Poaceae*, Animals ; Cattle ; Diet/veterinary ; Digestion ; Feeding Behavior ; Female ; Plant Breeding ; Seasons |
| مستخلص: | Holstein × Gyr and Holstein are the primary dairy breeds used in tropical systems, but when rearing under pasture, feed intake, behavior, and performance might differ between them. This study aimed to evaluate the voluntary intake, nutrient digestibility, performance, and ingestive behavior of Holstein and Holstein × Gyr (½ Holstein × ½ Gyr) heifers managed in a rotational system of Guinea grass (Panicum maximum Jacq. cv. Mombaça). The experiment was conducted during the summer season throughout four periods of 21 d. Two 8-heifers (four Holstein and four Holstein × Gyr) groups, averaging 258.6 ± 24.79 kg and 157.1 ± 24.99 kg BW, were used. Each group grazed a separate set of 16 paddocks, and all heifers received a concentrate supplement daily. Heifers were weighed at the beginning and end of the experiment. Fecal, forage and concentrate samples were evaluated for their DM, CP, crude fat, ash, NDF, and indigestible NDF. Feeding behavior was evaluated through 24 h of live observation for 48 h of each experimental period. Grazing, ruminating, resting, and intake of concentrate times were recorded, and rumination criteria, bout criteria, mealtime, meal frequency, and meal duration were calculated. There was no difference in total dry matter intake (DMI), but forage DMI of Holstein × Gyr was 11.70 % greater than the Holstein heifers. The Holstein × Gyr heifers had greater NDF intake and feed efficiency tended to show greater CP and NDF digestibilities, consequently, they had greater average daily gain (ADG). Holstein grazed less than Holstein × Gyr heifers in the afternoon. Ruminating time was 18.43 % lower for Holstein than Holstein × Gyr heifers, and rumination criteria (i.e. longest non-feeding interval within a rumination event) were greater for Holstein heifers. Holstein heifers presented more prolonged rumination bouts and resting time than Holstein × Gyr heifers. Holstein × Gyr can ingest and ruminate greater amounts of fibrous material, and Holstein heifers needed to spend more time ruminating the cud. Overall, even though the behavior was not markedly different between breeds, rearing young Holstein heifers in tropical pasture conditions is less suitable than Holstein-Gyr because of their lower ADG. Therefore, this management condition seems appropriate for Holstein × Gyr but inappropriate for Holstein dairy heifers. (Copyright © 2022 The Authors. Published by Elsevier B.V. All rights reserved.) |
| فهرسة مساهمة: | Keywords: Bout criteria; Dairy; Intake; Replacement; Ruminating |
| تواريخ الأحداث: | Date Created: 20220814 Date Completed: 20220920 Latest Revision: 20220920 |
| رمز التحديث: | 20221213 |
| DOI: | 10.1016/j.animal.2022.100613 |
| PMID: | 35964480 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1751-732X |
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| DOI: | 10.1016/j.animal.2022.100613 |