Diet Selection by Domestic Goats in Relation to Blackbrush Twig Chemistry

Provenza, Frederick D.; Malechek, John C.

doi:10.2307/2405050

Cited by 85 publications

(32 citation statements)

References 21 publications

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“…The rhinoceros were eating quebracho and tannic acid for six months and the hair sheep were fed L. latisiliquum fodder for three months. It has been previously suspected that goats might have TBSP in their saliva (Provenza and Malechek 1984;Vaithiyanathan et al 2001), and the present results support earlier evidence of the TBSP presence in adult Criollo goats from the same region (AlonsoDíaz et al 2012). Goats from tropical regions, such as South Mexico, have been in contact with tannin-rich materials for several generations.…”

Section: Saliva Turbidity and Ptisupporting

confidence: 91%

Do goats have a salivary constitutive response to tannins?

Ventura-Cordero

Sandoval-Castro

Torres-Acosta

et al. 2015

Journal of Applied Animal Research

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The effect of tannin-rich fodder (TRF) consumption on the saliva response of Criollo goats without previous browsing experience was determined. Eighteen kids were allocated into three treatments (n = 6 each): control group (CG), short-term tannin stimulus (TS) and long-term tannin stimulus (TL). Three experimental periods were used: adaptation (two weeks) in which the three treatment groups were fed Pennisetum purpureum grass and supplemented with a balanced feed. In period 1 (five weeks), TS and TL treatments were fed TRF (Lysiloma latisiliquum) with 55.5 g/kg DM condensed tannins (CT), grass and balanced feed. In period 2 (three weeks), L. latisiliquum fodder was withdrawn from the TS group. Thus, both the TS and the CG kids were only offered grass and balanced feed, while TL kids continued to receive TRF. In each period, saliva samples were collected to measure the tannin-protein interaction, salivary protein and protein turbidity index (PTI). The salivary protein was similar in all treatments and periods (P > .10). The goats' saliva reacted similarly when mixed with either tannic acid or L. latisiliquum water-acetone extract. Although the PTI tended to increase in the TL group compared to CG and TS with time, such difference was not significant. Thus, TRF intake failed to further increase the salivary response or PTI. Therefore, the saliva of goats from Yucatan, without previous browsing experience do have a constitutive response as it can block tannins irrespective of TRF stimulus. ARTICLE HISTORY

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Section: Saliva Turbidity and Ptisupporting

confidence: 91%

Do goats have a salivary constitutive response to tannins?

Ventura-Cordero

Sandoval-Castro

Torres-Acosta

et al. 2015

Journal of Applied Animal Research

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“…To further muddle the waters, herbivores don't always select the most nutritious foods, which certainly supports the alternative hypothesis that they lack nutritional wisdom. Domestic goats, for instance, prefer older growth to current season's growth from the shrub blackbrush, even though current season's growth is much more nutritious than older growth (41). Similar observations were noted for fishes, birds, and mammals (7,22,32,64).…”

supporting

confidence: 53%

Twenty-Five Years of Paradox in Plant-Herbivore Interactions and "Sustainable" Grazing Management

Provenza¹

2003

Rangelands

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“…Milne et al (1979) found that the intake rate of grazing sheep differed between summer and autumn. Goats might avoid a season's twigs as a result of their high tannin contents and their location within the plant canopy (Provenza & Malechek, 1984).…”

Section: Resultsmentioning

confidence: 99%

Diet selection by Nguni goats in the Zululand Thornveld

Basha¹,

Scogings²,

Nsahlai³

2010

SA J. An. Sci.

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________________________________________________________________________________ AbstractThe aim was to determine diet selection of goats grazing/browsing in Zululand Thornveld. An experiment was done in spring (November 2007) and autumn (March/April 2008) at Owen Sitole College of Agriculture, KwaZulu-Natal. Diet selection was estimated using direct observation of animals and an indirect plant-based method. The browse species observed in the plant-based methods were: Gymnosporia senegalensis (Gs), Acacia nilotica (An), Acacia karroo (Ak), Scutia myrtina (Sm) and Dichrostachys cinerea (Dc). Selection was determined by observing at regular intervals 40 marked branches on 10 plants of each browse species. Direct observation of diet selection was done by observing two goats in a base herd of 24 castrated males when they were allowed to forage together in a paddock of 1 ha. Observations were made every minute for three hours in the morning and 1.5 hours in the afternoon. The relative abundance of the browse species in the veld was determined and used to estimate the selection index (utilization relative to availability). In both seasons, the three most selected species according to the plant-based observations were Sm, Ak and Dc. Consistently, An experienced moderate defoliation and Gs the least. However, on the basis of the selection index the species followed the order: An>Dc>Ak>Sm>Gs in spring and An>Sm>Dc>Ak>Gs in autumn. The selection index was negatively correlated to all fibre attributes although the correlation attained significance only for NDF, ADF and lignin but not for tannins and cellulose. Both methods did not rank species in the same order, thus suggesting the need for further methodological refinement. ________________________________________________________________________________

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Diet Selection by Domestic Goats in Relation to Blackbrush Twig Chemistry

Cited by 85 publications

References 21 publications

Do goats have a salivary constitutive response to tannins?

Do goats have a salivary constitutive response to tannins?

Twenty-Five Years of Paradox in Plant-Herbivore Interactions and "Sustainable" Grazing Management

Diet selection by Nguni goats in the Zululand Thornveld

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