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פותח על ידי קלירמאש פתרונות בע"מ -
The implications of compound chew-bite jaw movements for bite rate in grazing cattle
Year:
2006
Source of publication :
Applied Animal Behaviour Science
Authors :
בן-משה, עזרא
;
.
Volume :
98
Co-Authors:
Ungar, E.D., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Ravid, N., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Zada, T., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Ben-Moshe, E., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Yonatan, R., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Baram, H., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Genizi, A., Department of Statistics and Experiment Design, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Facilitators :
From page:
183
To page:
195
(
Total pages:
13
)
Abstract:
Many aspects of the management of grazing systems are directly or indirectly related to the rate of herbage intake achieved by the animal. Intake rate depends, in part, on the time budget of the process, which derives from the basic behavioural component-the jaw movement. Chewing and biting jaw movements have generally been considered mutually exclusive, but acoustic monitoring has demonstrated the existence of the compound chew-bite jaw movement. We used a simple model to examine the implications of chew-bites for the forage-intake time budget, and tested it empirically. The model defines the total number of jaw movements per bite (α) and the number of chew actions per bite (β) in relation to the allocation of jaw movements between chews, bites and chew-bites. We examined empirically the variation among animals in the allocation of jaw movements for cattle (Bos taurus L.) grazing leafy, uniform swards in two separate studies. Grazing sessions were recorded on video, with the sound track originating from a forehead microphone. Each sound burst produced by a jaw movement was classified as a bite, chew or chew-bite. Jaw movements in these segments generated a virtually uninterrupted, regular succession of bite, chew and chew-bite sounds. Among individual animals, the variation in the rate of jaw movement was extremely low (Study 1: mean = 78.9 min-1, CV = 6%; Study 2: mean = 77.9 min-1, CV = 4%), but variation in the allocation of jaw movements was high (CV of proportion of jaw movements allocated to bites, chews and chew-bites = 58, 21 and 50%, respectively, for Study 1; 32, 12 and 32%, respectively, for Study 2). The proportions of chews and bites traded off directly against chew-biting. As the proportion of chew-bites increased, the number of jaw movements per bite declined and therefore the bite rate increased. Different combinations of the three types of jaw movement conformed to an isocline of a constant number of chew actions per bite (CV = 11 and 9% for Studies 1 and 2, respectively). Furthermore, this ratio was close to unity (1.27 and 1.24 chews per bite for Studies 1 and 2, respectively), and was similar for different levels of herbage mass in the range 145-255 g m-2. The possible implications of these findings for the regulation of bite weight and diet quality are discussed. © 2005 Elsevier B.V. All rights reserved.
Note:
Related Files :
Animalia
Behavioral Ecology
Bite dimensions
Bos taurus
cattle
diet
forage
Grazing
Mastication
monitoring
עוד תגיות
תוכן קשור
More details
DOI :
11
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
24187
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:05
Scientific Publication
The implications of compound chew-bite jaw movements for bite rate in grazing cattle
98
Ungar, E.D., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Ravid, N., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Zada, T., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Ben-Moshe, E., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Yonatan, R., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Baram, H., Department of Agronomy and Natural Resources, Institute of Field and Garden Crops, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
Genizi, A., Department of Statistics and Experiment Design, The Volcani Center, P.O.B. 6, Bet Dagan, 50250, Israel
The implications of compound chew-bite jaw movements for bite rate in grazing cattle
Many aspects of the management of grazing systems are directly or indirectly related to the rate of herbage intake achieved by the animal. Intake rate depends, in part, on the time budget of the process, which derives from the basic behavioural component-the jaw movement. Chewing and biting jaw movements have generally been considered mutually exclusive, but acoustic monitoring has demonstrated the existence of the compound chew-bite jaw movement. We used a simple model to examine the implications of chew-bites for the forage-intake time budget, and tested it empirically. The model defines the total number of jaw movements per bite (α) and the number of chew actions per bite (β) in relation to the allocation of jaw movements between chews, bites and chew-bites. We examined empirically the variation among animals in the allocation of jaw movements for cattle (Bos taurus L.) grazing leafy, uniform swards in two separate studies. Grazing sessions were recorded on video, with the sound track originating from a forehead microphone. Each sound burst produced by a jaw movement was classified as a bite, chew or chew-bite. Jaw movements in these segments generated a virtually uninterrupted, regular succession of bite, chew and chew-bite sounds. Among individual animals, the variation in the rate of jaw movement was extremely low (Study 1: mean = 78.9 min-1, CV = 6%; Study 2: mean = 77.9 min-1, CV = 4%), but variation in the allocation of jaw movements was high (CV of proportion of jaw movements allocated to bites, chews and chew-bites = 58, 21 and 50%, respectively, for Study 1; 32, 12 and 32%, respectively, for Study 2). The proportions of chews and bites traded off directly against chew-biting. As the proportion of chew-bites increased, the number of jaw movements per bite declined and therefore the bite rate increased. Different combinations of the three types of jaw movement conformed to an isocline of a constant number of chew actions per bite (CV = 11 and 9% for Studies 1 and 2, respectively). Furthermore, this ratio was close to unity (1.27 and 1.24 chews per bite for Studies 1 and 2, respectively), and was similar for different levels of herbage mass in the range 145-255 g m-2. The possible implications of these findings for the regulation of bite weight and diet quality are discussed. © 2005 Elsevier B.V. All rights reserved.
Scientific Publication
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