scholarly journals Herbage intake, ingestive behaviour and diet selection, and effects of condensed tannins upon body and wool growth in lambs grazingLolium perenneandHolcus lanatusswards in summer

1997 ◽  
Vol 40 (4) ◽  
pp. 449-461 ◽  
Author(s):  
F. Montossi ◽  
J. Hodgson ◽  
S. T. Morris
Keyword(s):  
Condensed Tannins ◽  
Diet Selection ◽  
Wool Growth ◽  
Herbage Intake ◽  
Ingestive Behaviour

scholarly journals A comparative study of herbage intake, ingestive behaviour and diet selection, and effects of condensed tannins upon body and wool growth in lambs grazing Yorkshire fog (Holcus lanatus) and annual ryegrass (Lolium multiflorum) dominant swards

2001 ◽  
Vol 136 (2) ◽  
pp. 241-251 ◽  
Author(s):  
F. MONTOSSI ◽  
J. HODGSON ◽  
S. T. MORRIS ◽  
D. F. RISSO ◽  
I. L. GORDON
Keyword(s):  
Condensed Tannins ◽  
Lolium Multiflorum ◽  
Fibre Diameter ◽  
Diet Selection ◽  
Carcass Weight ◽  
Annual Ryegrass ◽  
Holcus Lanatus ◽  
Wool Growth ◽  
Herbage Intake ◽  
Grazing Behaviour

An experiment was carried out from August to early November 1994 to examine differences in diet selection, herbage intake, grazing behaviour and animal performance between weaned lambs rotationally grazing swards of annual ryegrass (Lolium multiflorum)/white clover (Trifolium repens) and Yorkshire fog (Holcus lanatus)/T. repens with or without Lotus corniculatus. There were four replicate groups of six lambs per treatment. The effects of condensed tannins (CT) on lamb production were assessed by twice-daily oral administration of 10g polyethylene glycol (PEG; molecular weight 4000) to half the lambs on each sward. The Lotus content of all swards was very low, and results are presented here for main sward comparisons meaned over lotus treatments. Overall mean estimates of pre-grazing herbage mass and sward surface height for the annual ryegrass and Yorkshire fog swards respectively, were 5820 v. 4360±190 kgDM/ha (P<0·001) and 29 v. 21±0·6cm (P<0·001). The coefficient of organic matter digestibility (OMD) of the diet selected and herbage intake were higher on Yorkshire fog than on annual ryegrass (0·78 v. 0·74 ± 0·080g/kg; P<0·05, and 1070 v. 860±57g OM per lamb per day, P<0·05 respectively), reflecting the higher content in the diet of grass green leaf (980 v. 930g/kg±14g/kg, P<0·05) and the lower content of dead material (80 v. 110±15g/kg, P<0·08). Lambs grazing on Yorkshire fog swards had higher clean wool growth rate (1470 v. 1280±30mg/cm per day, P<0·01) and greater fibre diameter (31 v. 29±0·2μ, P<0·001), greater liveweight gain (152 v. 108±5·5g/day, P<0·001), final weight (42 v. 38±0·5kg, P<0·001), carcass weight gain (89 v. 69±2·5g/day, P<0·001), carcass weight (19 v. 17±0·3kg, P<0·001) and soft tissue thickness (GR value 11 v. 8±0·5mm, P<0·01), and lower faecal egg counts (FEC; square root transferred values 9·2 v. 11·0±0·4 eggs/g fresh faeces, P<0·01) than lambs grazing annual ryegrass swards. Similar dietary concentrations of condensed tannins (CT) between Yorkshire fog and annual ryegrass swards (4·2 v. 3·7 DM±0·2g/kg, P<0·08) increased clean wool growth (1440 v. 1310±32 mg/cm per day, P<0·05), fibre diameter (30·7 v. 29·5±0·21μ, P<0·01) and liveweight gain (141 v. 120±4·3g per lamb per day, P<0·01), although differences in carcass weight (17·9 v. 18·2±0·3kg) and FEC transformed values (9·6 v. 11·0±0·6 eggs/g fresh faeces) were not significant. The effects of CT on animal performance were greater in Yorkshire fog swards. CT had no significant effects on diet selection, herbage intake and grazing behaviour patterns.

MATCHING INGESTIVE BEHAVIOUR OF GOATS TO LOCAL FEED RESOURCES

2013 ◽  
Vol 67 (4) ◽  
Author(s):  
Phan Vũ Hải ◽  
Hồ Trung Thông ◽  
Đàm Văn Tiện
Keyword(s):  
Rice Straw ◽  
Social Facilitation ◽  
Diet Selection ◽  
Feed Resources ◽  
Local Feed Resources ◽  
Ingestive Behaviour

This study was undertaken to find ways of reducing the time taken by goats tobegin to eat an edible feed that they have not previously encountered. Experiment 1demonstrated that the time taken for goats (7-8 months old) to ingest an unfamiliar feed(rice straw) was shorter (4 days) when it was first offered to them in the presence offamiliar positive cues (the odor or flavor of juices extracted from previously eaten,nutritionally beneficial grasses), than if it was offered in the absence of such cues (10 days).In contrast, when the feed was offered in the presence of the odor of parasitised goat feces,the time to first ingestion was extended to 20 days. Experiment 2 showed that when sixmonthold goats were exposed to feeds they had not experienced previously (rice straw orrice bran) they did not ingest these feeds in less than 7 days. However, they commencedingesting these feeds immediately if they had been exposed to them, prior to weaning, inthe presence of their mother or another adult goat. Application of the principles of feedingbehavior, as illustrated by the present studies, to goats in Vietnam may improve theirproduction, especially when diets are changed frequently and include both familiar andunfamiliar materials.Keywords: Behavior; Diet selection; Flavor; Neophobia; Social facilitation; Goat.

Performance, digestibility, nitrogen balance and ingestive behaviour of goat kids fed diets supplemented with condensed tannins from Acacia mearnsii extract

2021 ◽  
Author(s):  
Paulo Roberto Silveira Pimentel ◽  
Caius Barcellos de Pellegrini ◽  
Jocasta Meira Galvão ◽  
Lara Maria Santos Brant ◽  
Claudio Vaz Di Mambro Ribeiro ◽  
...  
Keyword(s):  
Nitrogen Balance ◽  
Condensed Tannins ◽  
Acacia Mearnsii ◽  
Ingestive Behaviour

Constraints to the modelling of diet selection and intake in the grazing ruminant

1996 ◽  
Vol 47 (2) ◽  
pp. 257 ◽  
Author(s):  
H Dove
Keyword(s):  
Decision Support ◽  
Diet Selection ◽  
Point Of View ◽  
Botanical Composition ◽  
Factors Influencing ◽  
Major Constraint ◽  
Physical Chemical ◽  
Herbage Intake ◽  
Spatial Terms ◽  
Future Work

The interaction of grazing animals and their pasture generates substantial income for Australia, so that an interest in modelling the processes involved can be justified readily. Based on a brief review of the factors influencing diet selection, it is suggested that, from the point of view of modelling the process, a major constraint has been the availability of accurate and convenient methods for estimating the botanical composition of the consumed diet. It is also suggested that there is a need in future work to define more adequately the available herbage in botanical, physical, chemical and spatial terms, and to conduct experiments in which factors influencing selection are examined in an unconfounded way. It is further suggested that, while the idea of fixed preference or selection coefficients for particular species is attractive from a modelling standpoint, available evidence does not support the concept. Factors influencing herbage intake are then discussed, particularly in relation to the interaction between the degree of rumen fill and the animal's capacity to use energy. The manner in which this interaction has been used in the modelling of intake is then described briefly and the modeling of diet selection and intake within the decision-support system GrazFeed is presented by way of example. Finally, the constraints associated with model validation are discussed briefly, especially in relation to the need in future work to define more adequately the characteristics of the pasture on offer.

scholarly journals Liveweight gain, herbage intake, and ingestive behaviour in Compudose®‐treated and untreated steers at pasture

1996 ◽  
Vol 39 (2) ◽  
pp. 263-269 ◽  
Author(s):  
G. Aranda‐Osorio ◽  
S. T. Morris ◽  
S. N. McCutcheon ◽  
W. J. Parker
Keyword(s):  
Herbage Intake ◽  
Ingestive Behaviour

scholarly journals The effect of condensed tannins in Lotus corniculatus upon reproductive efficiency and wool production in sheep during late summer and autumn

1999 ◽  
pp. 51-55 ◽  
Author(s):  
T.N. Barry ◽  
W.C. Mcnabb ◽  
P.D. Kemp ◽  
G.C. Waghorn ◽  
B.R. Min ◽  
...  
Keyword(s):  
Condensed Tannins ◽  
Nutritive Value ◽  
Condensed Tannin ◽  
Late Summer ◽  
Lotus Corniculatus ◽  
Ovulation Rate ◽  
Maximum Increase ◽  
Wool Production ◽  
Voluntary Feed Intake ◽  
Wool Growth

(23 g condensed tannins (CT) /kg DM) and perennial ryegrass-white clover pasture (1 g CT/ kg DM) during the late summer/autumn of 1997 (Experiment 1) and 1998 (Experiment 2). Ewes were in thin condition and weighed 54 kg in Experiment 1 and were fat and weighed 60 kg in Experiment 2. Oestrus was synchronised for two cycles in Experiment 1 and four cycles in Experiment 2. Ewes were grazed at maintenance for the first 10 days of each oestrus cycle and then ad libitum for the last 6 days, including ovulation. Half the ewes grazing L. corniculatus were drenched twice daily with polyethylene glycol (PEG), to inactivate the condensed tannins. Relative to ewes grazing pasture, grazing ewes on L. corniculatus increased both ovulation rate (OR) and wool production, with the response in OR being greater in Experiment 1 (34%) than in Experiment 2 (13%). Maximum increase in OR occurred after grazing lotus for two cycles (5 weeks). Increases in fecundity were caused by a reduction in the proportion of ewes exhibiting single ovulation and increases in the proportions having doubled and triple or quadruple ovulations. As judged by responses to PEG supplementation, part of the L. corniculatus response in OR could be explained by action of CT in Experiment 1 but not in Experiment 2. As voluntary feed intake was similar between the treatments, feeding L. corniculatus improved the efficiency with which ingested nutrients were used for reproduction and wool growth. It was concluded that grazing L. corniculatus during autumn has most potential for increasing OR in lighter ewes. Keywords: condensed tannin, forage, Lotus corniculatus, nutritive value, ovulation rate, wool growth Abbreviations

Spray-topping annual grass pasture with glyphosate to delay loss of feeding value during summer. III. Quantitative basis of the alkane- based procedures for estimating diet selection and herbage intake by grazing sheep

1999 ◽  
Vol 50 (4) ◽  
pp. 475 ◽  
Author(s):  
H. Dove ◽  
J. T. Wood ◽  
R. J. Simpson ◽  
B. J. Leury ◽  
T. A. Ciavarella ◽  
...  
Keyword(s):  
Diet Composition ◽  
Nutritive Value ◽  
Diet Selection ◽  
Leaf Sheath ◽  
Multivariate Statistical ◽  
Plant Parts ◽  
Seed Head ◽  
Herbage Intake ◽  
Quantitative Basis ◽  
Objective Basis

Previous papers in this series have demonstrated that, when annual pastures were sprayed at seed head emergence with low rates of the herbicide glyphosate, the nutritive value of the sprayed herbage was improved. Housed sheep preferred sprayed herbage to unsprayed herbage and, within sprayed herbage, appeared to have a preference for stem material. The housed sheep ate more of the sprayed material and their weight gains were improved. If such responses occurred in grazing animals, they could result in substantial improvements in animal liveweights or wool production. The present paper describes the alkane-based procedures used to investigate diet selection and herbage intake in grazing animals, with the emphasis placed on methodological and statistical issues. The alkane concentrations in the plant fractions (leaf, leaf sheath, stem, seed head) of sprayed and unsprayed herbage are reported. Similarly, the alkane concentrations in extrusa samples collected by oesophageally fistulated sheep given access to the grazed areas, and in the faeces of sheep grazing the areas, are reported. Patterns of alkane concentrations in extrusa and faeces were similar and indicated that, in the short term, oesophageally fistulated animals consumed a diet of similar composition to that selected by the animals resident on the plots. Using these data for alkane concentrations, multivariate statistical analyses are presented which provide an objective basis for selecting the alkanes to be used in the estimation of diet selection. The results of the first of 4 grazing periods are presented, as an example of the application of the alkane-based procedures for estimating herbage intake and, in particular, diet composition. Use of these techniques indicated that, when given access to sprayed senescent pasture, sheep consumed more digestible dry matter and selected more of it from the stem fraction than was the case with unsprayed herbage. These results are similar to those found with housed animals and demonstrate that patterns of herbage and faecal alkane concentrations can be used to estimate diet composition of grazing animals in terms of the plant parts on offer

Modelling preference and diet selection patterns by grazing ruminants: a development in a mechanistic model of a grazing dairy cow, MINDY

2015 ◽  
Vol 55 (3) ◽  
pp. 360 ◽  
Author(s):  
P. Gregorini ◽  
J. J. Villalba ◽  
F. D. Provenza ◽  
P. C. Beukes ◽  
J. M. Forbes
Keyword(s):  
Dairy Cow ◽  
Mechanistic Model ◽  
Low Cost ◽  
Food Selection ◽  
Feeding Management ◽  
Diurnal Patterns ◽  
Herbage Intake ◽  
Ingestive Behaviour ◽  
Advance Knowledge ◽  
Cattle And Sheep

The work presented here represents additions to the mechanistic and dynamic model of a grazing dairy cow (MINDY). The additions include a module representing preference and selection, based on two theories, namely, post-ingestive feedback and discomfort. The model was evaluated by assessing its ability to simulate patterns of preference and selection in response to a variety of feeding management. The improvements detailed here enable a realistic simulation of patterns of food selection by grazing ruminants, based on a range of feeding situations from different studies with cattle and sheep. These simulations indicate that the concepts encoded in MINDY capture several of the underlying biological mechanisms that drive preferences and selective behaviour. Thus, simulations using MINDY allow prediction of daily and diurnal patterns of selection based on preference, derived from some post-ingestive feedbacks and total discomfort. Estimates of herbage intake and parallel measurements of ingestive behaviour, rumen function and metabolism in grazing ruminants pose experimental and technical difficulties, and matching these processes to animal preference and selective behaviour is a greater challenge. As a consequence, advances in knowledge of foraging behaviour and dietary choice are slow and costly. On completion of more thorough testing, MINDY can be used as a tool for exploratory mechanistic research, to design and organise experimental programs to address a range of factors that control intake and its ecology, helping advance knowledge faster and at a low cost.

Effect of condensed tannins upon the performance of lambs grazing Lotus corniculatus and lucerne (Medicago sativa)

1996 ◽  
Vol 126 (1) ◽  
pp. 87-98 ◽  
Author(s):  
Y. Wang ◽  
G. B. Douglas ◽  
G. C. Waghorn ◽  
T. N. Barry ◽  
A. G. Foote ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Condensed Tannins ◽  
Volatile Fatty Acids ◽  
Rumen Fluid ◽  
Lotus Corniculatus ◽  
Ammonia Concentration ◽  
Research Station ◽  
Oral Supplementation ◽  
Voluntary Feed Intake ◽  
Wool Growth

SUMMARYA grazing experiment, conducted for 22 weeks in 1992/93 at Aorangi Research Station, AgResearch Grasslands, Manawatu, New Zealand, compared the productivity of weaned lambs grazing Lotus corniculatus (birdsfoot trefoil) and lucerne (Medicago sativa). Effects of condensed tannins (CT) in lotus were evaluated by studying the responses of lambs to twice daily oral supplementation with polyethylene glycol (PEG). A rotational grazing system with restricted feed allowance was used. Measurements were made of pre- and post-grazing herbage mass, the composition of the feed on offer and diet selected, voluntary feed intake (VFI), liveweight gain (LWG), carcass growth, wool growth and the concentration of metabolites in rumen fluid. For both lotus and lucerne swards, the diet selected was mainly leaf. Lotus contained 34 g total CT/kg dry matter in the diet selected, whilst there were essentially no CT in lucerne. Compared to lambs grazing lucerne, lambs grazing lotus had slightly lower VFI, and higher LWG, carcass weight gain, carcass dressing-out percentage and wool growth. PEG supplementation had no effect on these measurements or upon the composition of rumen fluid in lambs grazing lucerne. However, in lambs grazing lotus, PEG supplementation reduced wool growth (10·9 ν. 12·1 g/day), slightly reduced LWG (188 ν. 203 g/day), increased rumen ammonia concentration, and increased the molar proportions of /.so-butyric, isovaleric and n-valeric acids and protozoa numbers in rumen fluid. PEG supplementation did not affect carcass gain, carcass fatness or the molar proportion of rumen acetic, propionic or n-butyric acids in lambs grazing lotus. It was concluded that the principal effect of CT in growing lambs grazing lotus was to increase wool growth without affecting VFI, thereby increasing the efficiency of wool production, that the greater rate of carcass gain of lambs grazing lotus than those grazing lucerne was mainly caused by factors other than CT and that CT did not affect the rumen fermentation of carbohydrate to major volatile fatty acids.

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