Selection of diet by sheep grazing semi-arid pastures on the Riverine Plain. 2. A cotton bush (Kochia aphylla) - grassland (Stipa variabilis-Danthonia caespitosa) community

1966 ◽  
Vol 6 (23) ◽  
pp. 468 ◽  
Author(s):  
JH Leigh ◽  
WE Mulham
Keyword(s):  
Sheep Grazing ◽  
Practical Application ◽  
Lolium Rigidum ◽  
Merino Sheep ◽  
Grassland Community ◽  
Resistant Species ◽  
Drought Resistant ◽  
Visual Assessments ◽  
Semi Arid ◽  
Selection Of

The diet selected by Merino sheep grazing a cotton bush (Kochia aphylla)-grassland community was determined by analysing extrusa from wethers fitted with oesophageal fistula. Visual assessments were combined with hand clipped samples to determine the amount of forage available. In winter and spring the major constituents of the diet were the grasses Danthonia caespitosa and Lolium rigidum Gaudich., and the herbs Hypochaeris spp. and Hedypnois cretica (L.) Willd. In summer the grasses Sporobolus caroli Mez and Chloris truncata R. Br. were selected. The various species of Chenopodiaceae were largely ignored. A practical application of this information is presented in which it is suggested that the more acceptable, but short-lived spring forage can be fully utilized and the relatively unacceptable, but drought resistant, species of Chenopodiaceae be conserved for use during stress periods.

Selection of diet by sheep grazing semi-arid pastures on the Riverine Plain. 1. A bladder saltbush (Atriplex vesicaria)-cotton bush (Kochia aphylla) community

1966 ◽  
Vol 6 (23) ◽  
pp. 460 ◽  
Author(s):  
JH Leigh ◽  
WE Mulham
Keyword(s):  
Sheep Grazing ◽  
Merino Sheep ◽  
Minor Portion ◽  
A Minor ◽  
Associated Species ◽  
Visual Assessments ◽  
Semi Arid ◽  
Selection Of

The diet selected by Merino sheep grazing a bladder saltbush (Atriplex vesicaria Hew. ex Benth.)- cottonbush (Kochia aphylla R.Br.) community was determined by analysing extrusa from wethers fitted with oesophageal fistulas. Visual assessments were combined with hand clipped samples to determine the amount of forage available. The results showed that the dominant constituent of the pasture, bladder saltbush, was sparingly grazed, whereas many of the associated species, which often constituted only a minor portion of the total available forage, were heavily grazed.

Selection of diet by sheep grazing semi-arid pastures on the Riverine Plain. 4. A grassland (Danthonia caespitosa) community

1967 ◽  
Vol 7 (28) ◽  
pp. 426 ◽  
Author(s):  
GW Robards ◽  
JH Leigh ◽  
WE Mulham
Keyword(s):  
Nitrogen Content ◽  
Grazing Pressure ◽  
In Vitro Digestibility ◽  
Sheep Grazing ◽  
Resistant Species ◽  
Heavy Grazing ◽  
Visual Assessments ◽  
Selection Of

The diet selected by Merino sheep grazing a Danthonia caespitosa Gaudich. grassland was determined by analysing extrusa from Merino wethers fitted with oesophageal fistulas. Visual assessments were combined with hand clipped samples to determine the amount of forage available. In spring a large proportion of the diet consisted of annual species. In summer, when the range of species present in the pasture was low, Danthonia caespitosa made up the bulk of the diet. Under heavy grazing the amount of dry material and burrs of Medicago polymorpha L. in the diet increased as the supply of Danthonia caespitosa decreased. Nitrogen content and in vitro digestibility, both of the pasture and of the forage eaten during spring, decreased as forage availability decreased under heavy grazing. These values were lower in summer than in spring, but showed little change under increasing grazing pressure. The quality of the pasture, as assessed by nitrogen content and digestibility, would have been sufficient, even in the dry summer experienced during this study, to enable sheep to increase in body weight. Because of the lack of drought-resistant species capable of producing appreciable amounts of forage in the summer-autumn period, it is improbable that any system of management based on deferred or rotational grazing can be devised that will increase animal production from this pasture type.

scholarly journals RIQUEZA ESPECÍFICA EM ÁREAS DE CAMPO NATIVO IMPACTADAS POR VISITAÇÃO TURÍSTICA E PASTEJO NO PARQUE NACIONAL DOS CAMPOS GERAIS, PR

FLORESTA ◽  
2011 ◽  
Vol 41 (2) ◽  
Author(s):  
Karine Dalazoana ◽  
Rosemeri Segecin Moro
Keyword(s):  
Species Diversity ◽  
National Park ◽  
Anthropogenic Factors ◽  
Species Number ◽  
Anthropogenic Pressure ◽  
Grassland Community ◽  
Campos De Altitude ◽  
Resistant Species ◽  
Native Grassland ◽  
Selection Of

O Parque Nacional dos Campos Gerais (PNCG) detém áreas de campos de altitude sob forte pressão antrópica, com a expansão das atividades agrícolas, pecuária, silvicultura e visitação turística desordenada. Devido ao impacto gerado, existe uma tendência à diminuição da riqueza específica, através da seletividade de espécies. Este trabalho analisa a resposta das comunidades campestres em termos de composição de espécies aos impactos de pastejo, roçada e pisoteio humano. Em quatro estações de coleta, foram determinados 107 táxons distribuídos em 23 famílias botânicas. As famílias com maior riqueza específica foram Asteraceae e Poaceae, ambas com 24 táxons, e Fabaceae, com 14 táxons. A riqueza específica variou de 27 a 75 espécies, com maior riqueza na estação não pastejada nem roçada, apenas visitada por turistas. O levantamento mostrou que, apesar da pressão antrópica, as áreas estudadas exibem considerável riqueza específica quando comparadas a outros trabalhos na região, mantendo ainda seu potencial biótico dinâmico. Floristicamente, os impactos gerados por gado ou por manejo com roçadeira se equivalem. Seis gêneros têm potencial para serem utilizados como bioindicadores de áreas conservadas: Croton, Galactia, Periandra, Cuphea, Pavonia e Commelina, mas há necessidade de ampliação das áreas estudadas para estabelecer mais claramente seu valor de bioindicação.Palavras-chave: Campo nativo; Campos Gerais; área impactada; pastejo; visitação turística. AbstractThe species diversity in native grassland areas that are under impact of tourism and grazing at Campos Gerais National Park, Parana, Brazil. Campos Gerais National Park (PNCG) has areas of grassland under high anthropogenic pressure, as expansion of agricultural activities, livestock, forestry and disorderly tourism. Due to these impacts, there is a tendency to decrease local biodiversity by selection of more resistant species. This paper focuses the grassland community answers to mowing, grazing and tourism. In four sampling sites it was determined 107 taxa belonging to 23 botanic families. The main families are Asteraceae (24 taxa), Poaceae (24 taxa) and Fabaceae (14 taxa). Species diversity varied from 27 to 75 species. In relation to species number, non-grazed areas presented greater diversity than other ones; it points to that touristic visitation may cause lower impact than grazing or mowing. In spite of the anthropogenic factors, the focused sites presented high specific diversity in relation to related areas. In relation to species diversity, grazing or mowing are equal. Six genera presented potentiality as bioindicators of preserved environments: Croton, Galactia, Periandra, Cuphea, Pavonia, and Commelina, although more sample areas are necessary to reliable results.Keywords: Grasslands; Campos Gerais; impacted area; grazing; touristic activities.

A note on increasing lamb production of fat-tailed Awassi and German Mutton Merino sheep grazing in a semi-arid area

1987 ◽  
Vol 44 (1) ◽  
pp. 169-172 ◽  
Author(s):  
A. A. Degen ◽  
R. W. Benjamin ◽  
E. Eyal
Keyword(s):  
Arid Area ◽  
Negev Desert ◽  
Sheep Grazing ◽  
Merino Sheep ◽  
Sheep Breeds ◽  
Arid Conditions ◽  
Semi Arid

The native fat-tailed Awassi and the imported German Mutton Merino (GMM) sheep are well adapted to semi-arid conditions (Degen, 1977; Degen and Shkolnik, 1978). This enables these sheep to graze large areas of the Negev Desert in Israel that is marginal for farming. However, under extensive conditions both these sheep breeds yield low lamb crops producing fewer than 1·0 lamb per ewe per year.

THE PERFORMANCE OF S170 TALL FESCUE IN CANTERBURY

1974 ◽  
pp. 214-215
Author(s):  
B.R. Watkin
Keyword(s):  
New Zealand ◽  
White Clover ◽  
Tall Fescue ◽  
Trifolium Repens ◽  
Festuca Arundinacea ◽  
Sheep Grazing ◽  
Selection Of

AN Aberystwyth selection of tall fescue (Festuca arundinacea Schreb.), known as S170, was sown with certified New Zealand white clover (Trifolium repens) and re' clover (T. pratense) and compared under sheep grazing with other grass/clover pastures at the Grasslands Division Regional Station at Lincoln (Watkin, 1975) .

Diversity of rhizobia nodulating sulla (Hedysarum coronarium L.) and selection of inoculant strains for semi-arid Tunisia

2011 ◽  
Vol 62 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Sana Dhane Fitouri ◽  
Darine Trabelsi ◽  
Sabrine Saïdi ◽  
Kais Zribi ◽  
Fayçal Ben Jeddi ◽  
...  
Keyword(s):  
Hedysarum Coronarium ◽  
Semi Arid ◽  
Selection Of

PSXII-2 Identification of candidate SNPs associated with high prolificacy in Romanov sheep

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 254-255
Author(s):  
Alexey V Shakhin ◽  
Arsen V Dotsev ◽  
Tatiana E Deniskova ◽  
Gottfried Brem ◽  
Natalia A Zinovieva
Keyword(s):  
Higher Education ◽  
Genetic Basis ◽  
Reference Genome ◽  
Unique Property ◽  
Candidate Snps ◽  
Merino Sheep ◽  
Sheep Breeds ◽  
Important Trait ◽  
Very High ◽  
Selection Of

Abstract Prolificacy is a very important trait in sheep. Romanov sheep, the well-known Russian sheep breed, are characterized by very high prolificacy; however, the genetic basis of this unique property of Romanov sheep is still unknown. It was reported that Ovine BMPR1B gene, located on the OAR6, is associated with prolificacy in several sheep breeds. The aim of our study was to identify candidate SNPs within BMPR1B gene, related to prolificacy. To achieve this goal, using NGS technology, we sequenced ovine BMPR1B gene in Romanov sheep (n = 6), which are characterized by high prolificacy (about 270 lambs per 100 ewes). The sequences of BMPR1B gene of Noire du Velay, Tan, Southdown and Australian Horned Merino sheep breeds as well as Asiatic mouflon (n = 1), which are characterized by significantly lower prolificacy (from 110 to 180 lambs per 100 ewes) were derived from publicly available sources and used for comparison. FST analysis performed in PLINK 1.9 program revealed 10 SNPs with values higher than 0.8. The majority of candidate SNPs under putative selection were localized in the region from 29,382,098 to 29,430,387 on OAR6 of Ovine reference genome (Oar_v3.1 (Ensembl release 98). Thus, we can suggest, that this region of the BMPR1B gene can be considered as the putative region, associated with high prolificacy of Romanov sheep. Additional studies will be needed to confirm the effect of identified candidate SNPs on prolificacy traits. The research results will be useful for artificial selection of sheep with higher prolific capacity, including the introduction of desired alleles in sheep populations using genome editing technologies. This work was supported by the Russian Ministry of Science and Higher Education No. 0445-2019-0024 and RFBR No. 20-516-56002.

scholarly journals FUZZY MULTI-CRITERIA DECISION MAKING MODEL FOR SUBCONTRACTOR SELECTION IN INTERNATIONAL CONSTRUCTION PROJECTS

2015 ◽  
Vol 22 (2) ◽  
pp. 210-234 ◽  
Author(s):  
Serdar ULUBEYLI ◽  
Aynur KAZAZ
Keyword(s):  
Construction Projects ◽  
Decision Criterion ◽  
Practical Application ◽  
Human Judgment ◽  
Qualitative And Quantitative ◽  
International Construction ◽  
Weak Points ◽  
Initial Idea ◽  
Decision Making Model ◽  
Selection Of

A general contractor’s ability to select proper subcontractors in foreign projects is a key competitive advantage. Toward this aim, a subcontractor selection model (CoSMo) was developed in this study. As a computational approach, the fuzzy sets method was employed because it can model human judgment by means of linguistic values, combining qualitative and quantitative decision criteria into an aggregate measure. Although the algorithm may be complex for easy acceptance by industrial practitioners, this disadvantage was minimized through a computer-supported system. In order to gain a better understanding of the current practice of CoSMo, a real world construction project was conducted. As a result, it was observed that CoSMo has high practical application and can be used as an advisory system by satisfying principal contractor’s requirements to reduce the risk involved in the selection of a subcontractor. Moreover, it gives an initial idea of how subcontractors perform on each decision criterion and allows the main contractor to understand the picture on the strong and weak points of each bidder and thereby to take conscious decisions.

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