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Articles 1471 - 1500 of 11239
Full-Text Articles in Weed Science
Le Lupin (Lupinus Sp.) Dans L'Alimentation Animale: Note Preliminaire Sur La Composition Chimique Et La Valeur Energetique De Cultivars Pauvres En Alcaloides, Angelina Cavaliere, Andrea M.R Lanza, L Postiglione, F Intreieri
Le Lupin (Lupinus Sp.) Dans L'Alimentation Animale: Note Preliminaire Sur La Composition Chimique Et La Valeur Energetique De Cultivars Pauvres En Alcaloides, Angelina Cavaliere, Andrea M.R Lanza, L Postiglione, F Intreieri
IGC Proceedings (1977-2023)
Le Lupin est une plante qui contient un taux eleve d'alcaloi:des. Ceux-ci ont constitue jusqu'a present la plus importante limite a l'emploi des graines de cette espece dans l'alimentation du betail. Ces dernieres annees, des recherches ont ete effectuees qui tendent a la selection de varietes de lupin doux, parmi lesquelles se distinguent celles obtenues par Postiglione et al. Les resultats du present travail portent sur la composition chimique et sur la valeur energetique de ces lignees et varietes.
Etude De Quelques Facteurs De Variation De La Digestibilite De Prairies Permanentes Durant La Pousse Printaniere, M Duru, A Gibon
Etude De Quelques Facteurs De Variation De La Digestibilite De Prairies Permanentes Durant La Pousse Printaniere, M Duru, A Gibon
IGC Proceedings (1977-2023)
Pour disposer de bases simples de prevision de la qualite des fourrages de prairies permanentes, on propose generalement de ramener les variations de digestibilite a !'age du fourrage indexe sur une date fixe du calendrier (Andrieu et Weiss, 1981) ou aux stades phenologiques du dactyle, pris comme plante de reference (Fleury et al., 1988). Nous etudions ici les variations de digestibilite de prairies permanentes de montagne (Pyrenees) en fonction des types de prairies et de leurs modalites de gestion, afin de discuter ces bases de prevision.
Inhibitory Effect Of Penicillin Like Metabolites Of Paecilomyces Carneus On In Vitro Dry Matter Digestibility Of Grasses, T Eiriksson, O Gudmundsson, S Olafsson, A Taylor
Inhibitory Effect Of Penicillin Like Metabolites Of Paecilomyces Carneus On In Vitro Dry Matter Digestibility Of Grasses, T Eiriksson, O Gudmundsson, S Olafsson, A Taylor
IGC Proceedings (1977-2023)
Insufficient growth of lambs grazed on lowland mires in Iceland is well documented but not clearly understood (Gudmundsson, 1988). It is also well established world wide that toxic substances which occur on grassland pastures can cause ruminal disorder and retard animal growth (Culvenor, 1987). Such toxins may be inorganic in nature, but more frequently, they are organic metabolites, for example fungal toxins either on the topsoil either on or within the plant. In Nova Scotia, Canada, where ill-thrift is common, researches have confirmed an interaction between fungal flora of soils and metabolism of rumen bacteria (Brewer et al., 1979; Liss …
Quantitative And Qualitative Changes Of The Chryosopogonetum Grylli Community Under The Long Term Npk Fertilization, J Pavesic-Popovic, D Kolarski, N Tancic
Quantitative And Qualitative Changes Of The Chryosopogonetum Grylli Community Under The Long Term Npk Fertilization, J Pavesic-Popovic, D Kolarski, N Tancic
IGC Proceedings (1977-2023)
Natural communities Chrysopogonetum grylli of low productive xerotherm grass Chrysopogon gryllus (1) Trin., have spread in the mountainous regions of Serbia (Kojic, 1958), so that even with a low productivity, 1-2 t/ha dry matter (Ocokoljic et al., 1983) represents an important source of fodder. In order to increase yield of thermophylic communities, different doses and combinations of mineral fertilizers NPK were used between 1965 and 1988.
Evaluation Of New Varieties Of Fodder Beet (Majoral And Poly Productiva) As New Summer Forages In Egypt, M S. Nowar, S M. Abd El-Baki, I F. Marie, A A. Zaki
Evaluation Of New Varieties Of Fodder Beet (Majoral And Poly Productiva) As New Summer Forages In Egypt, M S. Nowar, S M. Abd El-Baki, I F. Marie, A A. Zaki
IGC Proceedings (1977-2023)
Interest in fodder beet has increased dramatically in many parts of the world. Owing to its yield during summer season in Egypt, time during which shortage of green and succulent forage occurs, interest in its cultivation started early (Ghoneim, 1967 and Abou El-Hassan et al., 1971). Fodder beet has improved cows condition and milk yield and quality (Kocisova, 1976; Burckhardt, 1979; De Brabander et al., 1981 and Pearce, 1983). Fodder beet can considerably increase the farm total energy production. However, to grow it successfully the farmer must have an « arable» mentality (Pearce, 1983). The present research was conducted to …
Chemical Regulation Of Growth And Quality Of Orchardgrass/Alfalfa Mixtures, S L. Fales
Chemical Regulation Of Growth And Quality Of Orchardgrass/Alfalfa Mixtures, S L. Fales
IGC Proceedings (1977-2023)
Although mixtures tend to provide a better balance of nutrients and can produce higher forage yields, they are more difficult to manage than either grasses or legumes alone (Baylor, 1974). Furthermore; quality can be variable, due to species differences in rates of maturation, and this commonly ��results�� in wastage because one of the mixture components typically 1s harvested at a later than ideal stage of maturity. If the growth and chemical composition of one component could be manipulated by the producer, improvements in efficiency could result. This may be possible with plant growth regulators. Recent developments in herbicide chemistry have …
Nutritive Value Of Some Grass Species In Hungary, J Varhegyi
Nutritive Value Of Some Grass Species In Hungary, J Varhegyi
IGC Proceedings (1977-2023)
Demarquilly and Weiss (1970), Becker and Nehring (1969), Aman and Lindgren (1983) etc. reported data for the digestibility and nutritive value of different grass species. The present paper reports the chemical composition and the digestibility of the following species grown in Hungary: smooth brome-grass (Bromus inermis), meadow fescue (Festuca pratensis), orchardgrass (Dactylis glomerata), reed canarygrass (Phalaris arundinacea), tall fescue (Festuca arundinacea) and crested wheatgrass (Agropyron cristatum). The data were obtained during long term investigation from 1975 to 1983, but crested wheatgrass from 1980-83.
Influence Of The Level Of Feeding And Hay Addition On The Apparent Digestibility Of Whole Crop Sorghum Silage Based Diets, M Ogawa, A Oshibe, T Mashubuchi
Influence Of The Level Of Feeding And Hay Addition On The Apparent Digestibility Of Whole Crop Sorghum Silage Based Diets, M Ogawa, A Oshibe, T Mashubuchi
IGC Proceedings (1977-2023)
Dairy cows have to have a large feed intake for abundant milk production. It is generally known that a decrease in digestibility of rations is associated with an increased level of feeding (Schneider and Flatt, 1975). When a ration is almost all roughage, it appears that the difference in digestibility between an abundant ration and a scanty one may not be large, but a decrease in ration digestibility with increasing intake is large markedly as the proportion of concentrate in the ration is increased. A ration consisting of whole sorghum plant silage and concentrate develops a tendency to increase the …
Influence Of Temperatures On The Earliness Of Heading And Nutritive Value Of Two Grasses During The First Growth Cycle, J Andrieu, M Berekoutou
Influence Of Temperatures On The Earliness Of Heading And Nutritive Value Of Two Grasses During The First Growth Cycle, J Andrieu, M Berekoutou
IGC Proceedings (1977-2023)
The two objectives of this study were: I) to see if the method of the sums of temperatures allowed for a correct prediction, not only of the earliness of heading but also of the quality of spring growth whatever the surrounding conditions ; 2) to check that the criteria, suggested jn the feed Tables published by INRA in France (INRA 1981; INRA 1988) to predict the quality of spring growth, could be used for the whole of France. This study is drawn from the thesis ofM. Berekoutou (1986).
Valeur Alimentaire Des Associations Graminees- Trefle Blanc Au Stade Du Paturage, R Giovanni
Valeur Alimentaire Des Associations Graminees- Trefle Blanc Au Stade Du Paturage, R Giovanni
IGC Proceedings (1977-2023)
Cette etude a eu pour objectif de comparer la composition et la digestibilite du trefle blanc a celles des deux principales gra-. minees fourrageres, le ray-grass anglais (RG) et le dactyle (D), utilisees dans l'Ouest de la France. En effet, ii est apparu interessant de preciser !'influence du trefle blanc (TB) sur la valeur alimentaire de son association avec ces graminees. Cette etude a ete effectuee simultanement sur des fourrages coupes distribues a des moutons en cage de digestibilite et sur des echantillons preleves a chaque cycle du paturage de jeunes bovins.
Accumulation Of Solar Energy By Plants And Energetic Nutritive Value Of Tall Fescue (Festuca Arundinacea Schreb.) At Different Cutting Frequencies, V P. Spasov, D S. Kornyshev
Accumulation Of Solar Energy By Plants And Energetic Nutritive Value Of Tall Fescue (Festuca Arundinacea Schreb.) At Different Cutting Frequencies, V P. Spasov, D S. Kornyshev
IGC Proceedings (1977-2023)
The prevailing approach for developing fodder base in the North-Western economic region of the USSR is grass feed production. So, choosing plants which should maximize the accumulation of solar energy and provide high yields of quality satisfying cattle requirements is of exclusive importance. Our many year studies of different perennial grasses showed that tall fescue is one of the best to use solar energy in the given conditions of environment. So the experiment was carried out in 1979-1986 with the aim of determining solar energy accumulation and energetic nutritive value of this crop at different cutting frequencies.
Bio-Agronomic Traits And Nutritional Value In Italian Ryegrass Varieties, N Berardo, C Locatelli, R Paoletti, L Valdicelli, M Odoardi
Bio-Agronomic Traits And Nutritional Value In Italian Ryegrass Varieties, N Berardo, C Locatelli, R Paoletti, L Valdicelli, M Odoardi
IGC Proceedings (1977-2023)
Italian ryegrass (Lolium multiflorum Lam. var. Italicum) is native to the Po valley. Persistent populations of this species represent the main grass component of the irrigated permanent meadows in this area (Rotili et al., 1985). The subspecies Italicum (biannual, non alternative) and Westerwoldicum (annual, alternative) are at present the most important cultivated grasses in Italy, and are grown either as component in the poliphytic meadows or as catch crop, followed by maize for silage or soybean. Lolium multiflorum is considered of great interest as forage crop in the high fertile soils of Po valley (Tana and Sebastiani, 1981 …
Composition Of The Diet Of Cattle Grazing In Integrated Sown Tropical Pasture-Savannah Production Systems, R R. Vera, B Rivera, J H. Weniger
Composition Of The Diet Of Cattle Grazing In Integrated Sown Tropical Pasture-Savannah Production Systems, R R. Vera, B Rivera, J H. Weniger
IGC Proceedings (1977-2023)
Extensive cow-calf grazing systems in the Eastern Plains of Colombia are characterized by the use of very limited areas of sown pastures, amounting to generally less than 5 % of the area (Kleiheisterkamp and Habich, 1985; Sere and Estrada, 1985). It has also been shown (Kleinheisterkamp and Habich, 1985) that management practices applied to the breeding herd are few and irregularly utilized. It is thus hypothesized that the transition of extensive cow-calf operations to more productive beef breeding systems will initially require the introduction of pastures with minimum management requirements that will allow a gradual evolution of existing grazing systems. …
Changes In Elephantgrass Plant Components With Maturity Ii. Crude Protein And Digestibility, P Mislevy, F G. Martin, M B. Adjei
Changes In Elephantgrass Plant Components With Maturity Ii. Crude Protein And Digestibility, P Mislevy, F G. Martin, M B. Adjei
IGC Proceedings (1977-2023)
Elephantgrass or napiergrass (Pennisetum purpureum Schum.) is a long-lived, tall perennial warm-season bunch grass. Under subtropical conditions where cool season temperatures to not drop below - 4 °C, elephantgrass will normally out yield Saccharum spp. with less winter kill and greater persistence under annual harvesting. Alexander (1985) in Puerto Rico indicated elephantgrass out yielded energycane when cut at 6-mo intervals, but was inferior to sugarcane when cut once annually. Calhoun and Prine (1985) and Capiel and Ashcraft (1972) indicated shoot yields increased as the length of harvest interval increased. Cutting elephantgrass at 6 wk intervals yielded only 20 t/ha …
Effect Of Water Deficit On The Quality Of Lucerne (Medicago Sativa L.), G Lemaire, J L. Durand, M Lila
Effect Of Water Deficit On The Quality Of Lucerne (Medicago Sativa L.), G Lemaire, J L. Durand, M Lila
IGC Proceedings (1977-2023)
The nutritive value for ruminants of lucerne forage may be characterized both by the In Vitro Digestibility of Dry Matter (IVDDM) and by the Nitrogen content (N % ) which determine the energy and nitrogen values. These two characteristics are linked to the Leaf/Stem ratio (L/S) (Demarquilly, 1966). But for the same L/S ratio, different IVDDM and N % can be obtained according to the biochemical composition of leaves and stems separately. The effect of water deficit on the quality of forage of lucerne can be considered separately on the morphological composition and on the biochemical composition. L/S is generally …
Millet Based Cropping Systems With Forage Legumes For Improving Nutritive Values Of Crop Residues In The Sahelian Zone, C Renard, M Garba
Millet Based Cropping Systems With Forage Legumes For Improving Nutritive Values Of Crop Residues In The Sahelian Zone, C Renard, M Garba
IGC Proceedings (1977-2023)
The crop residues from sorghum and pearl millet represent an important potential feed resource. In 1981, 55.2 and 51.4 million tons of crop residues were produced from sorghum and pearl millet respectively (Kossila, 1985). Pearl millet is the most prevalent cereal in the Sahel and farmers usually leave millet stover in the field after grain harvest. Grazing livestock then walk through the fields and eat first the leaves and later the stalks. Farmers also use millet stalks as fuel, and for construction. During the long Sahelian dry season, cattle rely mostly on crop residues for their subsistence and in dry …
Utilization Of Lignin According To Christian As An Internal Marker For Assessing Digestibility Of Temperate Grasses With Or Without Supplementation In Adult Rams, A Thewis, F Rodriguez, E Francois, N Bartiaux-Thill
Utilization Of Lignin According To Christian As An Internal Marker For Assessing Digestibility Of Temperate Grasses With Or Without Supplementation In Adult Rams, A Thewis, F Rodriguez, E Francois, N Bartiaux-Thill
IGC Proceedings (1977-2023)
Use of indigestible plant constituents as internal markers as opposed to fecal index methods and in vitro techniques, has the distinct advantage of measuring digestibility directly in vivo and in the pasture. Lignin and acid insoluble ash are the most frequently employed markers. Grass contaminated by soil renders the method using insoluble ash rather unreliable, while lignin as reported by Fahey and Jung (1983) also presents problems it is either partially digested or gives positive fecal recovery by binding of endogenous constituents of indeterminate nature. It would seem however that results obtained are directly related to analytical method used (Rodriguez, …
The Effect Of Supplementation Of Setaria Grass With Cassava Or Gliricidia Leaves On Growing Sheep, S S. Sitorus
The Effect Of Supplementation Of Setaria Grass With Cassava Or Gliricidia Leaves On Growing Sheep, S S. Sitorus
IGC Proceedings (1977-2023)
In tropical areas, grasses are the main forage offered to ruminant, eventhough they have low quality such as native grass crude protein of about 7-12 %, and napier grass about 9-14 %. Recently in Indonesia, plantation of setaria grass was introduced especially in transmigration and watershed areas, regardless its nutritive value, and its influence on animal performances. Similar with other grasses, setaria grass has a low nutritive value and when fed alone can not meet the production requirements. More over, Jones et al. (1970) reported that cattle with setaria in a grazing system can lead to the death due to …
Composition Chimique, Valeur Alimentaire Et Production Du Ray Grass D'Italie (Lolium Multiflorum L.) Conduit En Irrigue Sous Climat Mediterraneen, M Mejjati-Alami, N Rihani, F Guessous
Composition Chimique, Valeur Alimentaire Et Production Du Ray Grass D'Italie (Lolium Multiflorum L.) Conduit En Irrigue Sous Climat Mediterraneen, M Mejjati-Alami, N Rihani, F Guessous
IGC Proceedings (1977-2023)
La culture de la luzerne (Medicago sativa L.) dans le Nord Ouest du Maroc se heurte a de nombreuses difficultes parmi lesquelles les conditions pedoclimatiques defavorables a son implantation. C'est la raison pour laquelle les systemes fourragers de cette region reposent essentiellement sur !'utilisation en vert du bersim (Trifolium alexandrinum L.) pendant l'hiver et le printemps. Cependant, la tres forte teneur en eau de cette plante la rend tres difficile a conserver, ce qui pose des problemes de calendrier alimentaire pour les troupeaux laitiers pendant l'ete et le debut d'automne. De ce fait, !'introduction du Ray-grass d'Italie (RGI) a …
Proportion Of Leaves And Floral Tillers And Nutritional Quality Of Prolific And Non-Prolific Seed Yielding Cultivars Of Smooth Bromegrass, S Bittman, Z Mir, D H. Mccartney
Proportion Of Leaves And Floral Tillers And Nutritional Quality Of Prolific And Non-Prolific Seed Yielding Cultivars Of Smooth Bromegrass, S Bittman, Z Mir, D H. Mccartney
IGC Proceedings (1977-2023)
In the semi-arid clima\e of the Canadian Prairies most herbage production occurs in May and June whereas the grazing season lasts until October. Summer and fall pasture consists largely of mature, quiescent vegetation with senescent leaves and lignified stems. Floral tillers of some temperate grasses have a higher rate of leaf senescence than non-floral tillers (Bittman et al., 1988) and are rejected by grazing cattle. Floral tillers of Stipa viridula Trin. and Pascopyrum sinithii (Rydb.) Love had 2 and 4 % units lower protein content and digestibility, respectively, than non-floral tillers (White, 1983). In the Parkland region of the prairies, …
Nutritive Value And Production Of Cool-Season Under Two Harvest Regimes, T Kunelius
Nutritive Value And Production Of Cool-Season Under Two Harvest Regimes, T Kunelius
IGC Proceedings (1977-2023)
In Atlantic Canada, Phleum pratense L. is the predominant grass species grown for conserved feed and pasture. Although P. pratense is a persistent grass species under 2 cut systems (Kunelius and McRae, 1986) it does not perform adequately under intensive management. Secondary grasses for the Atlantic region include Dactylis glomerata L., Festuca pratensis L., Bromus inermis Leyss., and Lolium-Festuca hybrids. There is considerable interest in the performance and quality of secondary grasses and those of Lolium-Festuca hybrids in particular, under various management regimes. In this experiment the growth and quality of several cool season grasses were determined under four and …
Change In Composition And Quality Of A Temperate Species Mixed Pasture Grazed Over Three Years At Two Stocking Rates With And Without Nitrogen Fertilizer, K Betteridge, D A. Haynes, J R. Sedcole
Change In Composition And Quality Of A Temperate Species Mixed Pasture Grazed Over Three Years At Two Stocking Rates With And Without Nitrogen Fertilizer, K Betteridge, D A. Haynes, J R. Sedcole
IGC Proceedings (1977-2023)
Animal production is not only affected by pasture mass and its seasonal distribution but also by the composition and quality of the consumed pasture (Rattray and Clark, 1984). Legumes have a higher nutritive value than grasses, but may be suppressed by application of artificial nitrogen (N) when soil N status is low (Ball and Field, 1982). Nutritive value of pasture falls as it matures due to a rise in fibrous tissue and a decline in digestibility, and mineral and protein content (Ulyatt, 1978). However, vegetative growth can be prolonged and quality maintained by greater utilisation of pasture in late spring …
Smooth Brome Response To Rate And Date Of Mefluidide Application, B Anderson, R S. Moomaw, C A. Shapiro
Smooth Brome Response To Rate And Date Of Mefluidide Application, B Anderson, R S. Moomaw, C A. Shapiro
IGC Proceedings (1977-2023)
Smooth brome (Bromus inermis Leyss.) often produces over 70 % of its annual growth during spring. Summer growth and forage quality are poor. Mefluidide suppresses seedstalk production and improves forage quality of many cool-season grasses (Sheaffer and Marten, 1986). This study evaluated the response of smooth brome to date and rate of mefluidide application.
Evaluating Forage Quality As Animal Production Per Unit Of Forage And Land Area, D A. Rohweder, L Miller
Evaluating Forage Quality As Animal Production Per Unit Of Forage And Land Area, D A. Rohweder, L Miller
IGC Proceedings (1977-2023)
The need to more adequately express feed value in forages and, that will communicate this value among agricultural scientists, agri-business clientele and producers has long been recognized world wide. Modern dairy, beef and sheep producers are becoming increasingly concerned about forage quality ; its translation into animal products per unit land area ; and its effect along with forage yield on enterprise profits. The Hay Marketing Task Force-Forage Analysis Subcommittee organized by the American Forage and Grassland Council in 1975 proposed hay standards based on in vivo digestible dry matter or energy availability (DDM) and dry matter intake (DMI) predicated …
Adaptation And Forage Quality Of Grasses Grown Under Shade, K D. Kephart, D R. Buxton
Adaptation And Forage Quality Of Grasses Grown Under Shade, K D. Kephart, D R. Buxton
IGC Proceedings (1977-2023)
The three fundamental environmental factors which influence plant growth are water, temperature, and light. Light may be separated into photoperiod - and irradiance - related factors. Grasses adapt to reduced irradiance regimes by increasing leaf area and stem length and by decreasing leaf thickness and plant dry weight. Leaf thickness in grasses is altered by changes in cell size (Cooper and Tainton, 1968). These morphological and anatomical adjustments to irradiance regime may affect cell-wall concentration and forage quality. Adaptation to reduced irradiance has resulted in lower soluble carbohydrate concentration and increased total-nitrogen concentration (Deinum and Dirven, 1972; Wong and Wilson, …
Differences In Nutritive Value Of Lecerne Cut In Morning And Afternoon Hours, F Plhak
Differences In Nutritive Value Of Lecerne Cut In Morning And Afternoon Hours, F Plhak
IGC Proceedings (1977-2023)
Beside crude fibre and protein, the photosynthetic products - nonstructural carbohydrates - are further important substances of digestible dry matter in lucerne fodder. They participate in dry matter by 15 %. In contrast to crude fibre and protein, the content of photosynthates changes expressively during the day (Plhak, 1984). The changes reach in leaves by 20 %, in stems 5 % of dry matter. The changes depend on the length and intensity ofsolar irradiance (Plhak, 1981) and cause specific weight alteration of leaves (Chatterton et al., 1972). Such variations in photosynthates content can cause some changes in dry matter digestibility …
Productivity And Nutritive Values In Three Ecotypes Of Trichloris Crinita, Native Forage Grass Of The Arid Zones Of Argentina, J Silva Colomer, J B. Cavagnaro, J Lemes, M Medero
Productivity And Nutritive Values In Three Ecotypes Of Trichloris Crinita, Native Forage Grass Of The Arid Zones Of Argentina, J Silva Colomer, J B. Cavagnaro, J Lemes, M Medero
IGC Proceedings (1977-2023)
Livestock activity in the arid and semiarid regions of the west central part of Argentina is mainly based on native grasses. On the plain areas of Mendoza province, the most important grasses are perennial, warm-season species, adapted to water stress, high temperature and high irradiance conditions (Cavagnaro, 1988). Mean rainfall of the area reached at 264 mm during the growing season. Trichloris crinita is one of the outstanding species in many areas of the mentioned region. In order to preserve genetic variability of natural populations, IADIZA (Instituto Argentino de Investigacion de Zonas Aridas) initiated a germplasm bank of native forage …
Evaluating Maturity And Preservation Method Of Alfalfa On Optimum Rations For Lactating Dairy Cattle Based Upon Neutral Detergent Fiber Concentration Of The Total Diet, R W. Hintz, D R. Mertens, K A. Albrecht
Evaluating Maturity And Preservation Method Of Alfalfa On Optimum Rations For Lactating Dairy Cattle Based Upon Neutral Detergent Fiber Concentration Of The Total Diet, R W. Hintz, D R. Mertens, K A. Albrecht
IGC Proceedings (1977-2023)
Previous research has shown that formulating rations based upon neutral detergent fiber (NDF) concentration of the total diet can be an effective means of maximizing the performance of lactating dairy cattle (Mertens, 1982). Results of these studies indicated that ration formulation using NDF is a robust procedure, but that differences in the optimum NDF level may exist between forages conserved in different manners. To determine if the method of forage preservation affects the optimum NDF concentration of diets, a study was designed to compare the response of lactating dairy cattle to diets of identical NDF concentration formulated using third-crop alfalfa …
Animal Performance As Effected By Herbage Availability And Quality In Semi-Arid Southern African Grassland, J E. Danckwerts
Animal Performance As Effected By Herbage Availability And Quality In Semi-Arid Southern African Grassland, J E. Danckwerts
IGC Proceedings (1977-2023)
Rotational grazing with beef cattle is widely advocated and practised under commercial pastoralism in semi-arid grassland in southern Africa. Since animal performance is largely a function of the quality and quantity of forage ingested, changes in herbage quality and availability in these situations are likely to have an important influence on animal production. The objective of this paper is therefore to quantify changes in the quality of herbage ingested by beef cattle at different times of the year and as grazing pressure increases within periods of occupation on rotationally grazed semi-arid grassland in southern Africa. The effect of these changes …
The Intake And Digestibility Of Dry Mature Subterranean Clovers, G B. Taylor, R C. Rossiter, D B. Purser, W J. Collins
The Intake And Digestibility Of Dry Mature Subterranean Clovers, G B. Taylor, R C. Rossiter, D B. Purser, W J. Collins
IGC Proceedings (1977-2023)
Although sheep grazing dry subterranean clover (Trifolium subterraneum L.) pasture may maintain body weight for the early part of summer, they usually lose weight during late summer and autumn, with consequent adverse effects on productivity (Purser, 1980). A decline in the digestibility of clover during plant senescence (Hume and Purser, 1975) is believed to be an important component of the reduced nutritive value of this dry feed. In a survey of dry mature stem material from a range of early flowering subterranean clover genotypes, Taylor et al. (1987a) found that in vitro digestibility ranged between 41 and 62 % …