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2023

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Articles 1051 - 1080 of 1707

Full-Text Articles in Agricultural Science

Effect Of A Summer Period At Pasture On The Performance Of Young Bulls Offered Concentrates Ad Libitum, R. J. Fallon, M. G. Keane Apr 2023

Effect Of A Summer Period At Pasture On The Performance Of Young Bulls Offered Concentrates Ad Libitum, R. J. Fallon, M. G. Keane

IGC Proceedings (1977-2023)

Holstein bull calves can produce a 250 kg carcass at 11 to 12 months of age on indoor feeding of ad libitum concentrates. An outdoor period at pasture would reduce housing costs. Two experiments were undertaken to determine the effect of an outdoor period at pasture on concentrate intake, liveweight gain and selected carcass traits of Holstein young bulls.

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Spring Calving Suckler Beef Systems: Influence Of Grassland Management System On Herbage Availability, Utilisation, Quality And Cow And Calf Performance To Weaning, M. J. Drennan, M. Mcgee, S. Kyne, B. O'Neill Apr 2023

Spring Calving Suckler Beef Systems: Influence Of Grassland Management System On Herbage Availability, Utilisation, Quality And Cow And Calf Performance To Weaning, M. J. Drennan, M. Mcgee, S. Kyne, B. O'Neill

IGC Proceedings (1977-2023)

Suckler beef systems in Ireland are primarily based on grass. Suckler systems vary in intensity but many operate low input systems and participate in REPS (Rural Environmental Protection Scheme). As there is a considerable cost associated with second-cut silage this research compared a two-cut system with a simplified low input one-cut system.

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Effect Of Time Spent On Pasture On Milk Production And Quality In Latxa Dairy Sheep, A. Garcia-Rodriguez, N. Mandaluniz, L. M. Oregui Apr 2023

Effect Of Time Spent On Pasture On Milk Production And Quality In Latxa Dairy Sheep, A. Garcia-Rodriguez, N. Mandaluniz, L. M. Oregui

IGC Proceedings (1977-2023)

Dairy sheep production systems in the Basque country are pasture based. Forage resources are managed by shepherds who match herbage, forage and supplement availability with production requirements. This is achieved through a part-time grazing system, where ewes spend 3 to 7 hours grazing. The aim of this study was to evaluate the effect of restricted access to pasture on milk production and quality.

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Animal Unit Of Sheep (Zel Breed) Grazing In Mazandaran Grasslands In Iran, Hossein Arzani, Reza Erfanzadeh, S. Farazmand Apr 2023

Animal Unit Of Sheep (Zel Breed) Grazing In Mazandaran Grasslands In Iran, Hossein Arzani, Reza Erfanzadeh, S. Farazmand

IGC Proceedings (1977-2023)

Animal unit equivalents (AUEs), provide a means of summarising grazing capacity, calculating stocking rates and other stocking variables (Scarnecchia, 1990). Animal units (AU) are often defined in relation to the dominant animal type in an area In Iran there are 27 sheep breeds which are classified into three main body size classes, namely: small, medium and large. The objective of this experiment was to define animal units, animal and forage requirements for sheep grazing in Mozandaran grasslands.

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Mixed Fattening Of Steers And Lambs On Improved Grasslands In Uruguay: I. Pasture Performance, D. F. Risso, Fabio Montossi, E. J. Berretta, R. Cuadro, I. De Barbieri, R. San Julián, A. Dighiero, A. Zarza Apr 2023

Mixed Fattening Of Steers And Lambs On Improved Grasslands In Uruguay: I. Pasture Performance, D. F. Risso, Fabio Montossi, E. J. Berretta, R. Cuadro, I. De Barbieri, R. San Julián, A. Dighiero, A. Zarza

IGC Proceedings (1977-2023)

The use of P fertilisers together with legume broadcasting is a low cost and high impact technology for improving native grassland (Risso et al., 2001). Its use is increasing in Uruguay, although not for mixed grazing, even though this management is a common practice on native grasslands. Good pasture response may occur under mixed grazing when it is adequately managed (Nolan & Connolly, 1989). The following trials characterise pasture response with such management, in Uruguayan conditions.

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Mixed Fattening Of Steers And Lambs On Improved Grasslands In Uruguay: Ii. Animal Performance And Productivity, D. F. Risso, Fabio Montossi, E. J. Berretta, R. Cuadro, I. De Barbieri, R. San Julián, A. Dighiero, A. Zarza Apr 2023

Mixed Fattening Of Steers And Lambs On Improved Grasslands In Uruguay: Ii. Animal Performance And Productivity, D. F. Risso, Fabio Montossi, E. J. Berretta, R. Cuadro, I. De Barbieri, R. San Julián, A. Dighiero, A. Zarza

IGC Proceedings (1977-2023)

In cow-calf operations in Uruguay, mixed cattle and sheep grazing on rangelands is predominant, while fattening is a specialised process. Within certain limits of the lamb/steer ratio and stocking rate, a complementary grazing effect occurs under mixed grazing, improving net results (Nolan & Connolly, 1977; Risso et al., 2002). These trials characterise animal performance under such management.

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The Rostock Energetic Feed Evaluation On The Base Of Net Energy, W. Jentsch, A. Chudy, M. Beyer, S. Kuhla Apr 2023

The Rostock Energetic Feed Evaluation On The Base Of Net Energy, W. Jentsch, A. Chudy, M. Beyer, S. Kuhla

IGC Proceedings (1977-2023)

Feed evaluation was an emphasis of research from the foundation of the "Oskar-Kellner-Institute of Animal Nutrition" in 1953 at Rostock by Prof. Kurt Nehring. The aim of the research work was the elaboration of a feed evaluation system containing reference numbers of feed values and requirements of farm animals. The approach and the present system are outlined in this paper.

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Constraints On Dairy Cattle Production From Locally Available Forages In Bangladesh, M. A. S. Khan Apr 2023

Constraints On Dairy Cattle Production From Locally Available Forages In Bangladesh, M. A. S. Khan

IGC Proceedings (1977-2023)

The productivity of milk producing animals in Bangladesh is low because of low individual yield and poor fertility. The reasons for the low productivity are complex but, in order of priority, appear to be (a) the imbalanced nature of the nutrients that arise from the digestion of the forage resources, (b) the incidence of disease/parasitism, and (c) the often harsh climatic circumstances. Thus, the purpose of this study was to find out the practical constraints on dairy cattle production from locally available forages under small holding village conditions of Bangladesh.

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Effects Of Supplementary Concentrate Level And Separate Or Mixed Feeding Of Grass Silage And Concentrates On Rumen Fluid Composition In Steers, J. Caplis, M. G. Keane, F. P. O'Mara Apr 2023

Effects Of Supplementary Concentrate Level And Separate Or Mixed Feeding Of Grass Silage And Concentrates On Rumen Fluid Composition In Steers, J. Caplis, M. G. Keane, F. P. O'Mara

IGC Proceedings (1977-2023)

The effects of dietary concentrate level and method of feeding (separate or mixed) on performance and carcass traits of steers may be mediated through changes in rumen fluid composition. The objectives of this study were to determine the effects on rumen fluid composition of (1) supplementary concentrate level with grass silage, and (2) separate or mixed feeding of silage and concentrates,

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Body Temperature In Free-Roaming Beef Cattle, T. L. Mader, S. L. Colgan Apr 2023

Body Temperature In Free-Roaming Beef Cattle, T. L. Mader, S. L. Colgan

IGC Proceedings (1977-2023)

Body temperature (BT) measurements are traditionally used in diagnosing sick animals, but may also be used as an indicator of stress or activity. Based on results of metabolism studies, Mader et al. (1999) reported that BT can vary as much as 0.9oC and can depend on metabolisable energy (ME) of the diet consumed. Acceptable measures of BT can be obtained from the rectum, vagina, or ear canal. Technologies are also being developed for continuously monitoring BT via radio-telemetry. The objectives of this study were to determine the effect of high concentrate (low fibre) versus high fibre diets on …

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Yield And Quality Parameters Of An Interspecific Hybrid Pennisetum Purpureum Schum. (Elephant-Grass) X Pennisetum Glaucum (L.) R. Br. Stuntz (Pearl Millet), J. A. Usberti Jr., R. Usberti, P. B. Alcantara, V. B. G. Alcantara, R. A. Possenti, M. A. C. Lucena Apr 2023

Yield And Quality Parameters Of An Interspecific Hybrid Pennisetum Purpureum Schum. (Elephant-Grass) X Pennisetum Glaucum (L.) R. Br. Stuntz (Pearl Millet), J. A. Usberti Jr., R. Usberti, P. B. Alcantara, V. B. G. Alcantara, R. A. Possenti, M. A. C. Lucena

IGC Proceedings (1977-2023)

Elephant-grass is a tropical forage grass used either as a supplement fodder or for direct grazing. It usually shows regular nutritive value (6-13% crude protein, CP, and 55-60% forage digestibility) (Alcantara et al., 1981). Most of the available cultivars produce no viable seeds. On the other hand, pearl millet has high seed yielding potential along with high quality forage (>15% CP and 70% forage digestibility). However, it shows poor forage production, low field persistence under grazing and low regrowth potential after cutting or grazing. During the 90's, an interspecific hybrid between the two species was developed, trying to …

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Development And Evaluation Of Pennisetum Purpureum Mutants Through Irradiation With 60Co, R. S. Herrera, M. García, R. Tuero, A. M. Cruz, A. Romero, N. Fraga Apr 2023

Development And Evaluation Of Pennisetum Purpureum Mutants Through Irradiation With 60Co, R. S. Herrera, M. García, R. Tuero, A. M. Cruz, A. Romero, N. Fraga

IGC Proceedings (1977-2023)

The development of plant mutants is a commonly used procedure nowadays. One way of obtaining mutant plants has been seed irradiation with gamma rays. As these studies are not common in tropical pasture species (Micke et al., 1993, Herrera, 2001), the objective of this study was the development and evaluation of Pennisetum purpureum mutants through irradiation with 60Co.

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Small Leaf Mid-Rib Xylem Related To Leaf Freeze Tolerance Trait In Bahia (Paspalum Notatum Flugge) Grass Lines, J. W. Breman, A. R. Blount, T. R. Sinclair Apr 2023

Small Leaf Mid-Rib Xylem Related To Leaf Freeze Tolerance Trait In Bahia (Paspalum Notatum Flugge) Grass Lines, J. W. Breman, A. R. Blount, T. R. Sinclair

IGC Proceedings (1977-2023)

Controlled freeze (-60o C) trials of 31 bahiagrass selections from a breeding program for cold tolerance by Blount et al. (2001) showed diverse genotype Leaf Tissue Cold Damage (LTCD). Breman et al. (2003) defined LTCD on a rating scale (1 = no damage to 9 = 100% leaf damage). Unique midrib damage was observed as part of LTCD in bahiagrass under transpiration stress after a freeze trial. Small xylem conduit diameter and area has been strongly correlated with reduced cavitation caused by freeze thaw cycles which maintain leaf tissue in evergreen temperate woody plants; further shown in …

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Assessment Of Inter-Specific Diversity Of The Hedysarum Genus In Tunisia, S. Marghali, H. Chennaoui, M. Marrakchi, N. Trifi-Farah Apr 2023

Assessment Of Inter-Specific Diversity Of The Hedysarum Genus In Tunisia, S. Marghali, H. Chennaoui, M. Marrakchi, N. Trifi-Farah

IGC Proceedings (1977-2023)

In Tunisia, many grassland and pasture species were menaced by genetic erosion. Thus, we were interested in the Hedysarum species which constitute a very important phytogenetic patrimony able to produce forage and restore destroyed pasture land especially in arid and semi-arid areas. In order to facilitate fodder improvement, we investigated the phenetic relationships among Hedysarum species using rDNA intergenic spacer (IGS) polymorphism.

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Breeding A Psyllid-Resistant Interspecific Hybrid Leucaena For Beef Cattle Production In Northern Australia, Scott A. Dalzell, F. Lemos De Moraes, G. Solis Pasos Apr 2023

Breeding A Psyllid-Resistant Interspecific Hybrid Leucaena For Beef Cattle Production In Northern Australia, Scott A. Dalzell, F. Lemos De Moraes, G. Solis Pasos

IGC Proceedings (1977-2023)

Production of the valuable fodder tree legume Leucaena leucocephala (leucaena) is limited to the subhumid (600-800 mm annual rainfall) areas of northern Australia by the psyllid insect pest Heteropsylla cubana. Defoliation caused by severe psyllid infestations can suppress forage yields of commercial leucaena varieties by 50-80%. Susceptibility to psyllid damage is a major impediment to grazier adoption of leucaena pastures in the more humid tropical areas of Australia. A comprehensive international agronomic evaluation of the entire Leucaena genus (Mullen et al., 2003) revealed that the artificial interspecific F1 hybrid of L. pallida x L. leucocephala ssp. glabrata …

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Physical And Quality Seed Traits Observed In New Pigeon Pea (Cajanus Cajan) Hybrids, R. Usberti, J. A. Usberti Jr., R. H. Aguiar, F. C. Simoes, F. N. Cavalcante, M. Harris, Maria T. Colozza, J. C. T. Freitas Apr 2023

Physical And Quality Seed Traits Observed In New Pigeon Pea (Cajanus Cajan) Hybrids, R. Usberti, J. A. Usberti Jr., R. H. Aguiar, F. C. Simoes, F. N. Cavalcante, M. Harris, Maria T. Colozza, J. C. T. Freitas

IGC Proceedings (1977-2023)

Pigeon pea seed production may be affected by factors such as % of pure seeds, mean seed weight, incidence of pests and diseases and environmental stresses. Harvested seeds from different cultivars may also vary in germination %, hardseededness and germination speed. Hardseededness (seed coat impermeability to water) commonly occurs in forage legume species (Hopkinson, 1993). There is considerable variation among different entries for seed characters but this is not considered within genetic materials. This research analysed harvested seeds of selected individuals of two segregating F2 pigeon pea populations for the above cited traits and assessed the range of variation …

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Genetic Variability Of Yield And Its Components In Winter Forage Pea Cultivars, V. Mihailović, A. Mikić, Đ. Karagić, S. Katić, I. Pataki Apr 2023

Genetic Variability Of Yield And Its Components In Winter Forage Pea Cultivars, V. Mihailović, A. Mikić, Đ. Karagić, S. Katić, I. Pataki

IGC Proceedings (1977-2023)

The genus Pisum (peas) is rich in variability of morphological traits. It provides an excellent basis for breeding, but is also one of the reasons for the still undefined status of Pisum taxons (Mihailović et al., 2004a). The majority of forage pea cultivars used belongs to subspecies sativum and variety arvense (Maxted & Ambrose, 2000). The objective of our study was to determine genetic variability of yield and its components in six winter forage pea cultivars of different origin and to evaluate their breeding potential.

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Agronomic Characteristics Of Novi Sad Winter Vetch Cultivars, V. Mihailović, A. Mikić, B. Ćupina, S. Vasiljević, D. Milić Apr 2023

Agronomic Characteristics Of Novi Sad Winter Vetch Cultivars, V. Mihailović, A. Mikić, B. Ćupina, S. Vasiljević, D. Milić

IGC Proceedings (1977-2023)

Genus Vicia. contains important annual food and forage species such as field bean, V. faba., narbon vetch, V. narbonensis, and common vetch, V. sativa (Maxted, 1995), while Hungarian V. pannonica Crantz and hairy vetch V. villosa also play an important role in the Balkans. Winter vetches are excellent forage catch crops useful for sustainable agriculture and organic farming (Ċupina et al., 2004). Our study was aimed at determining the agronomic characteristics of the winter vetch cultivars developed in Novi Sad, assessing thus their ability for successful growing in the prevailing conditions of Serbia and Montenegro.

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New Pigeon Pea (Cajanus Cajan) Hybrids With Desirable Forage Traits, P. B. Alcantara, J. A. Usberti Jr., C. A. Colombo, V. B. G. Alcantara, R. Usberti, M. A. C. Lucena, M. Harris Apr 2023

New Pigeon Pea (Cajanus Cajan) Hybrids With Desirable Forage Traits, P. B. Alcantara, J. A. Usberti Jr., C. A. Colombo, V. B. G. Alcantara, R. Usberti, M. A. C. Lucena, M. Harris

IGC Proceedings (1977-2023)

Pigeon pea is a tropical forage legume usually sown in mixed pastures with tropical forage grasses. Most of the available cultivars shows erect and tall plants with poor tillering potential, breakable thick stems, low leaf/stem ratios (fresh/dry matter) and low persistence under animal grazing. It shows a high dry matter production, due to low leaf/stem ratios (Barnes & Addo, 1997). Pigeon pea shows good crude protein levels/dry matter (ranging from 14-23%) and regular in vitro digestibility indexes (52-58%) (Karachi & Matata, 1996); animal consumption is affected by high tannin levels of young leaves. Being a self-pollinated species, the variability for …

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Development Of High-Yielding And Early-Maturing Korean Hairy Vetch, C. N. Shin, K. H. Ko Apr 2023

Development Of High-Yielding And Early-Maturing Korean Hairy Vetch, C. N. Shin, K. H. Ko

IGC Proceedings (1977-2023)

There are a number of forage cultivars recommended by the government, but only a few winter-spring legumes are available for the farmers in Korea. Hairy vetch has superior winter hardiness and produces high dry matter (DM) yield compared with crimson clover, Persian clover, rose clover, common vetch and Chinese milk vetch in Korea. However, under a double cropping forage production system an early maturing vetch cultivar was more productive than a late maturing one (Shin et al., 2000). The objective of this research was to develop a high yielding and early flowering new hairy vetch cultivar derived from an …

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Seasonal Variation Of Tannin Content On Pigeon Pea (Cajanus Cajan (L.) Millsp) Plants, Rodolfo Godoy, P. M. Santos, L. A. R. Batista Apr 2023

Seasonal Variation Of Tannin Content On Pigeon Pea (Cajanus Cajan (L.) Millsp) Plants, Rodolfo Godoy, P. M. Santos, L. A. R. Batista

IGC Proceedings (1977-2023)

Tannins reduce forage digestibility and palatability by reacting with proteins (Makkar, 1989) and due to that, tannin content is considered to be an important characteristic of leguminous crops and it has been used as a selection criterion on pigeon-pea improvement programs (Godoy et al., 1994). In Southeastern Brazil, pigeon pea is less consumed by bovines in the rainy season (October through March) than in the dry season (from April on), when flowering occurs. Alencar et al. (1991) found very little consumption by Canchim cows during the rainy season, and Lourenço et al. (1984) recommend pigeon-pea for feeding bovines in …

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Breeding Lotus Australis Andrews For Low Cyanide Content, D. Real, G. A. Sandral, J. Warden, L. Nutt, R. Bennett, D. Kidd Apr 2023

Breeding Lotus Australis Andrews For Low Cyanide Content, D. Real, G. A. Sandral, J. Warden, L. Nutt, R. Bennett, D. Kidd

IGC Proceedings (1977-2023)

Lotus australis Andrews is a native perennial tetraploid legume (2n=4x=28) widely distributed throughout Australia (Figure 1). It is highly variable with 14 botanical varieties reported in the Australian Plant Name Index (http://www.anbg.gov.au). Despite broad adaptation within L. australis no cultivars have been developed for cultivation. One of the main barriers to cultivation is the reported cyanogenic nature of the species (Foulds, 1982), which makes it potentially toxic when plant cyanogenic glycosides are fully hydrolysed to form hydrogen cyanide (HCN). Foulds (1982) also reported that the cyanophoric trait was polymorphic at seedling and adult stages with 12% of plants acyanogenic in …

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Analysis Of Genetic Diversity In White Clover (Trifolium Repens) Breeding Populations Using Agro-Morphological And Rapd Markers, T. R. Sharma, S. Singh, R. Rathour, S. K. Sharma Apr 2023

Analysis Of Genetic Diversity In White Clover (Trifolium Repens) Breeding Populations Using Agro-Morphological And Rapd Markers, T. R. Sharma, S. Singh, R. Rathour, S. K. Sharma

IGC Proceedings (1977-2023)

White clover is an important forage legume for temperate regions, but very little is known about the genetic organisation of its breeding populations. The low amount of variability in the Indian collections of white clover for genetic improvement warrants the introduction of new germplasm and collecting local ecotypes for characterisation, utilisation and conservation. Several molecular techniques have been used for germplasm characterisation, variety identification, marker development and identification, molecular diagnostics, phylogenetic studies and diversity analysis. Because of its simplicity, rapidity and reliability, the RAPD technique has been used extensively for diversity analysis. The present study aims at characterising white clover …

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Concurrent Selection For Low Coumarin And Multi-Stemmed Crowns In Annual Sweetclover, Gerald R. Smith, G. W. Evers Apr 2023

Concurrent Selection For Low Coumarin And Multi-Stemmed Crowns In Annual Sweetclover, Gerald R. Smith, G. W. Evers

IGC Proceedings (1977-2023)

Annual sweetclover (Melilotus alba Desr) is a reseeding, drought tolerant forage legume that is well adapted to the alkaline and neutral soils of the US Southern Great Plains. Coumarin is a phytochemical found in sweetclover that is a precursor to dicoumarol, which causes a toxic bleeding disease in cattle. The inheritance of low coumarin in sweetclover is determined by a single gene (Goplen et al., 1957), but current low coumarin cultivars are all biennial, northern types. The ability of annual sweetclover to develop a multi-stemmed crown, similar to alfalfa (Medicago sativa L.), is also under genetic control …

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Improving The Utilisation Of Germplasm Of Trifolium Spumosum L. By The Development Of A Core Collection Using Ecogeographical And Molecular Techniques, K. Ghamkhar, R. Snowball, S. J. Bennett Apr 2023

Improving The Utilisation Of Germplasm Of Trifolium Spumosum L. By The Development Of A Core Collection Using Ecogeographical And Molecular Techniques, K. Ghamkhar, R. Snowball, S. J. Bennett

IGC Proceedings (1977-2023)

A core collection is a sub-set encompassing more than 70% of the variability of all accessions held in a collection (Brown 1995), the development of one for Trifolium spumosum (bladder clover) could assist in future development of the cultivar within southern Australia. The aim of this work is to develop a core collection of Trifolium spumosum as a model for other pasture legume species using molecular and ecogeographical data.

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Evaluation Of White Clover Breeding Lines In The Australasian Region, Mohamed Z. Z. Jahufer, D. R. Woodfield, J. L. Ford, K. H. Widdup, J. F. Ayres, L. A. Lane Apr 2023

Evaluation Of White Clover Breeding Lines In The Australasian Region, Mohamed Z. Z. Jahufer, D. R. Woodfield, J. L. Ford, K. H. Widdup, J. F. Ayres, L. A. Lane

IGC Proceedings (1977-2023)

The accuracy of predicting breeding line performance across target environments is a significant criterion in the development of cultivars with broad or specific adaptation. This paper characterises the type and magnitude of genotype-by-environment (GE) interactions estimated from a multi-site white clover (Trifolium repens L.) breeding line evaluation trial conducted across sites in New Zealand and Australia.

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Quantitative Trait Locus Analysis Of Morphogenetic And Developmental Traits In An Ssr And Aflp-Based Genetic Map Of White Clover (Trifolium Repens L.), M. T. Abberton, N. O. I. Cogan, K. F. Smith, G. Kearney, A. H. Marshall, A. Williams, T. P. T. Michaelson-Yeates, C. Bowen, E. S. Jones, A. C. Vecchies, J. W. Forster Apr 2023

Quantitative Trait Locus Analysis Of Morphogenetic And Developmental Traits In An Ssr And Aflp-Based Genetic Map Of White Clover (Trifolium Repens L.), M. T. Abberton, N. O. I. Cogan, K. F. Smith, G. Kearney, A. H. Marshall, A. Williams, T. P. T. Michaelson-Yeates, C. Bowen, E. S. Jones, A. C. Vecchies, J. W. Forster

IGC Proceedings (1977-2023)

Molecular marker-assisted plant breeding is a key target for the temperate legume pasture crop white clover (Trifolium repens L.). The first genetic linkage map of white clover has been constructed using self-fertile mutants to derive an intercross based fourth and fifth generation inbred parental genotypes (F2[I.4R x I.5J]). The framework map was constructed using simple sequence repeat (TRSSR) and amplified fragment length polymorphism (AFLP) markers. Eighteen linkage groups (LG) corresponding to the anticipated 16 chromosomes of white clover (2n = 4x = 32), with a total map length of 825 cM were derived from a total of …

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Quantifying The Variation In Protein Content In White Clover (Trifolium Repens L.), A. H. Marshall, E. Sizer, A. Kingston-Smith, A. Williams, M. T. Abberton Apr 2023

Quantifying The Variation In Protein Content In White Clover (Trifolium Repens L.), A. H. Marshall, E. Sizer, A. Kingston-Smith, A. Williams, M. T. Abberton

IGC Proceedings (1977-2023)

White clover (Trifolium repens L.) is the main legume in temperate pastures. It has relatively low levels of water-soluble carbohydrate but produces forage of high quality with a high crude protein (CP) content and dry-matter digestibility (Beever, 1993). Some studies have suggested that the forage quality of white clover can be problematic because its high CP content may contribute to inefficient use of nitrogen in the rumen and exacerbate diffuse pollution via excreta (Waghorn & Caradus, 1994). The development of white clover germplasm with lower CP content would potentially benefit forage production and grassland management. A study was carried …

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New Approaches To Clover Breeding, M. T. Abberton, T. A. Williams, T. P. T. Michaelson-Yeates, A. H. Marshall, C. Jones, E. Sizer-Coverdale, R. P. Collins Apr 2023

New Approaches To Clover Breeding, M. T. Abberton, T. A. Williams, T. P. T. Michaelson-Yeates, A. H. Marshall, C. Jones, E. Sizer-Coverdale, R. P. Collins

IGC Proceedings (1977-2023)

White clover (Trifolium repens L.) and red clover (T. pratense) are the major forage legumes of temperate pastures. Breeding efforts have focused on overcoming the constraints to productivity and reliability in this species and thereby optimising their contribution to mixed swards. In recent years there has been an increased emphasis on livestock production and the efficient utilisation of forage material in the rumen. In this paper we report on a shift in the aims of forage legume breeding at IGER, building on a strong agronomic platform but giving greater consideration to the environmental footprint of our varieties …

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Forage Quality Of White Clover (Trifolium Repens L.) X Ball Clover (T.Nigrescens Viv.) Hybrids Over Three Harvest Years, T. P. T. Michaelson-Yeates, M. T. Abberton, A. H. Marshall, T. A. Williams, H. G. Powell, P. Olyott Apr 2023

Forage Quality Of White Clover (Trifolium Repens L.) X Ball Clover (T.Nigrescens Viv.) Hybrids Over Three Harvest Years, T. P. T. Michaelson-Yeates, M. T. Abberton, A. H. Marshall, T. A. Williams, H. G. Powell, P. Olyott

IGC Proceedings (1977-2023)

Introgression of reproductive traits from the annual, profusely flowering species ball clover into white clover is one route to improve seed yields in T.repens. The interspecific cross produced F1, backcross 1 (BC1), backcross 2 (BC2) and backcross 3 (BC3) plants with white clover as recurrent parent (Marshall et al., 2002). These hybrids were found to be comparable with white clover for yield and persistency but produced 30% more flowers and their forage quality, relative to white clover was investigated.

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