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Diet selection in dairy goats grazing woody Mediterranean rangeland
Year:
1998
Source of publication :
Applied Animal Behaviour Science
Authors :
Landau, Serge Yan
;
.
Perevolotsky, Avi
;
.
Ungar, Eugene David
;
.
Volume :
57
Co-Authors:
Perevolotsky, A., Dept. of Agronomy and Nat. Resources, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Landau, S., Dept. of Agronomy and Nat. Resources, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Kababia, D., Sheep and Goats Department, Extension Service, Ministry of Agriculture, Tel Aviv, Israel
Ungar, E.D., Dept. of Agronomy and Nat. Resources, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
117
To page:
131
(
Total pages:
15
)
Abstract:
We studied species selection, diet quality and voluntary intake of Anglo-Nubian X Damascus dairy goats grazing woody Mediterranean rangeland in the Jerusalem Hills, Israel. Measurements comprised direct observation of grazing behaviour, with the recording of all species encountered along the search path of a foraging goat, and the time spent grazing each species selected. The fraction of observation time spent grazing was 0.84, of which woody and herbaceous vegetation accounted for 0.68 and 0.15, respectively. Twenty plant types (species or species groupings) were encountered along the foraging paths of the goats observed. Six plant types accounted for nearly 80% of encounters. The overall probability of an encounter resulting in grazing was 0.37. Analysis by plant type showed that the conditional probability of being grazed increased with declining probability of encounter, especially for the rarest species encountered. Nevertheless, the relation between the proportion of grazing encounters and the probability of encounter, by plant type, showed quite small deviations from the 1:1 line. The mean duration of a grazing encounter was 35 s. Encounter duration increased with the conditional probability of being grazed and with the size group of the plant type. The relation between the proportion of grazing time for a plant type and the probability of encounter with that plant type showed a wide scatter about the 1:1 line, though size group explained some of this variation. The greatest proportion of grazing time was devoted to annual herbaceous vegetation (16%). This vegetation group together with Sarcopoterium spinosum, Calicotome villosa, Cupressus sempervirens and Quercus calliprinos, accounted for 64% of grazing time. On the basis of hand-collected bite-like samples, overall mean diet digestibility and crude protein content were 48.4 and 11.1%, respectively, and foraging rate was estimated to be 6.3 g DM/min or 1350 g DM per day.
Note:
Related Files :
Calicotome villosa
Capra hircus
Cupressus sempervirens
Diet selection
Goat
Israel
Mediterranean ecosystems
Sarcopoterium spinosum
Show More
Related Content
More details
DOI :
10.1016/S0168-1591(97)00120-2
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
27599
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:32
Scientific Publication
Diet selection in dairy goats grazing woody Mediterranean rangeland
57
Perevolotsky, A., Dept. of Agronomy and Nat. Resources, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Landau, S., Dept. of Agronomy and Nat. Resources, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Kababia, D., Sheep and Goats Department, Extension Service, Ministry of Agriculture, Tel Aviv, Israel
Ungar, E.D., Dept. of Agronomy and Nat. Resources, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Diet selection in dairy goats grazing woody Mediterranean rangeland
We studied species selection, diet quality and voluntary intake of Anglo-Nubian X Damascus dairy goats grazing woody Mediterranean rangeland in the Jerusalem Hills, Israel. Measurements comprised direct observation of grazing behaviour, with the recording of all species encountered along the search path of a foraging goat, and the time spent grazing each species selected. The fraction of observation time spent grazing was 0.84, of which woody and herbaceous vegetation accounted for 0.68 and 0.15, respectively. Twenty plant types (species or species groupings) were encountered along the foraging paths of the goats observed. Six plant types accounted for nearly 80% of encounters. The overall probability of an encounter resulting in grazing was 0.37. Analysis by plant type showed that the conditional probability of being grazed increased with declining probability of encounter, especially for the rarest species encountered. Nevertheless, the relation between the proportion of grazing encounters and the probability of encounter, by plant type, showed quite small deviations from the 1:1 line. The mean duration of a grazing encounter was 35 s. Encounter duration increased with the conditional probability of being grazed and with the size group of the plant type. The relation between the proportion of grazing time for a plant type and the probability of encounter with that plant type showed a wide scatter about the 1:1 line, though size group explained some of this variation. The greatest proportion of grazing time was devoted to annual herbaceous vegetation (16%). This vegetation group together with Sarcopoterium spinosum, Calicotome villosa, Cupressus sempervirens and Quercus calliprinos, accounted for 64% of grazing time. On the basis of hand-collected bite-like samples, overall mean diet digestibility and crude protein content were 48.4 and 11.1%, respectively, and foraging rate was estimated to be 6.3 g DM/min or 1350 g DM per day.
Scientific Publication
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