Dichrostachys cinerea and Acacia nilotica fruits as dry season feed supplements for goats in a semi-arid environment: Summary of a DFID funded project in Zimbabwe

Smith, Tim; Mlambo, Victor; Sikosana, J.L.N.; Maphosa, V.; Mueller-Harvey, Irene; Owen, E.

doi:10.1016/j.anifeedsci.2005.04.004

Cited by 26 publications

(15 citation statements)

References 10 publications

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“…and Dichrostachys cinerea (L.) Wight et Arn. are among the common woody browse plants that naturally grow in many arid and semi-arid rangelands in sub Saharan Africa (Le Houérou and Corra, 1980;Smith et al, 2005). These two woody browse species have increased in their abundance in the semi-arid Tigray region of northern Ethiopia with the construction of exclosures, which are used as means of rehabilitating degraded communal lands (REST, 1998;Asefa et al, 2003;Aerts et al, 2004).…”

Section: Introductionmentioning

confidence: 98%

Feeding Acacia etbaica and Dichrostachys cinerea fruits to smallholder goats in northern Ethiopia improves their performance during the dry season

2008

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Section: Introductionmentioning

confidence: 98%

Feeding Acacia etbaica and Dichrostachys cinerea fruits to smallholder goats in northern Ethiopia improves their performance during the dry season

2008

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“…The inactivation of tannins is caused by high pHmediated oxidation of tannins [97]. Wood ash at various levels (1-24 %) has been evaluated by different workers [22,23,87,97,199]. A 10 % solution of oak wood ash and pine wood ash decreased the content of total phenols, CTs and protein precipitation capacity in oak leaves by 66, 80, 75 % and 69, 85, 80 %, respectively [97].…”

Section: Wood Ashmentioning

confidence: 99%

“…The use of wood ash, a cheap source of alkali, holds potential for detanninification of tannin-rich feedstuffs. However, as this treatment also removes nutrients, its overall effectiveness is unclear and the method has to be validated by more animal experimental studies [23, 104,199].…”

Section: Wood Ashmentioning

confidence: 99%

Value Addition of Feed and Fodder by Alleviating the Antinutritional Effects of Tannins

et al. 2013

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Tannins are one of the important plant secondary metabolites having wide prevalence in the plant kingdom. They are a prominent constituent of various types of feed, fodder and agro-industrial wastes. The intake of tannins at a low level has recently been found to have some positive effects in ruminants. However, the use of tannin-rich biomass as animal feed, having high content of tannins, is limited by the antinutritional effects of tannins at this level in an animal system. A number of physical, chemical, biological and miscellaneous approaches have been developed for inactivation or removal of tannins for enhancement of the feeding value of tannin-rich biomass. However, none of the individual method is successful in total inactivation or removal of tannins without loss of nutritive value, and this limits the utilization of a vast amount of plant resource. A cohesive and an integrated detanninification strategy is required for alleviating the antinutritional effects of tannins in animals and upgrading the feeding value of tanniniferous biomass.

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“…Treating fruits with hot water could have resulted in an increased urinary N output in animals on boiled treatment, which led to a negative N retention. Although the results were not significant, negative retention could be a result of inadequate fermentable energy in the rumen, leading to an increase in urinary N (Smith et al, 2005). Negative N retention was also observed when goats were offered 200 g/day of untreated A. nilotica (Sikosana et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…The calcium hydroxide in BP provides an alkaline environment in which tannins undergo oxidation to inert forms (Mueller-Harvey & Mcallan, 1992). The alkaline nature of WA and heat from boiling water deactivates the tannin-protein bond in forages (Mukuru et al, 1992;Smith et al, 2005) hence releasing proteins for digestion and absorption by the ruminant. Despite this knowledge of the effects of these detannification agents in browse species, few attempts have been made to determine their efficacy on the fruits of A. nilotica and the subsequent impact of treating the fruits with detannification agents on goat performance.…”

Section: Introductionmentioning

confidence: 99%

Nutrient intake, digestibility and nitrogen retention in indigenous goats fed on <i>Acacia nilotica</i> fruits treated for condensed tannins

Tshabalala¹,

Sikosana²,

Chivandi³

2014

SA J. An. Sci.

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Polyethylene glycol (PEG 4000), Browse Plus TM (BP), wood ash (WA) and boiling water were evaluated as tannin deactivation methods on tannins in Acacia nilotica fruits. Twenty four Matebele goats of mean body mass, 38.7 ± 3.12 kg, were used in a digestibility and nitrogen balance trial. A completely randomized design was used, and the initial weight was used as a covariate in data analysis. The goats were randomly allocated to the treatments and were fed for 28 days on a basal diet of hay and A. nilotica fruits treated with PEG (MW 4000), BP, WA or boiling water. Acacia nilotica fruits had 4.39% catechin equivalents of condensed tannins, thus the amount of PEG, BP and WA used to treat the fruits was 1.5 parts per part of condensed tannin in the fruits. It was hypothesized that treating the fruits would deactivate the tannins in them and increase intake, digestibility and nitrogen retention. Treating the fruits for condensed tannins had no effect on hay and fruit intake. None of the treatments had an effect on the apparent digestibility of dry matter, organic matter, neutral and acid detergent fibre and nitrogen retention in the goats. The goats that were fed on the boiled fruits had a negative N retention of -1.03 g/day. It was concluded that none of the detannification methods improved feed intake, apparent nutrient digestibility and nitrogen retention. It is recommended that each detannification method should be tested on different types of tannins and at different concentrations before totally dismissing the treatments as not useful.________________________________________________________________________________

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Dichrostachys cinerea and Acacia nilotica fruits as dry season feed supplements for goats in a semi-arid environment: Summary of a DFID funded project in Zimbabwe

Cited by 26 publications

References 10 publications

Feeding Acacia etbaica and Dichrostachys cinerea fruits to smallholder goats in northern Ethiopia improves their performance during the dry season

Feeding Acacia etbaica and Dichrostachys cinerea fruits to smallholder goats in northern Ethiopia improves their performance during the dry season

Value Addition of Feed and Fodder by Alleviating the Antinutritional Effects of Tannins

Nutrient intake, digestibility and nitrogen retention in indigenous goats fed on <i>Acacia nilotica</i> fruits treated for condensed tannins

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