The comparative yield method for estimating dry matter yield of pasture

Haydock, KP; Shaw, NH

doi:10.1071/ea9750663

Cited by 336 publications

(306 citation statements)

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“…Para a estimativa da disponibilidade de fitomassa, foi utilizado o método do rendimento comparativo, desenvolvido por Haydock & Shaw (1975). No processamento dos dados, utilizou-se o programa computacional Botanal, desenvolvido por Hargreaves & Kerr (1978) que, pelo rendimento comparativo, fornece as estimativas de matéria seca total por componente e, pelo método do peso seco ordenado, as estimativas de composição botânica.…”

Section: Methodsunclassified

Caracterização da vegetação de Caatinga e da dieta de novilhos no Sertão de Pernambuco

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Lira

Santos

et al. 2006

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a composição botânica, a disponibilidade e a qualidade da forragem e da dieta de animais fistulados alimentados na Caatinga, no período chuvoso, em Pernambuco. Avaliaram-se a composição botânica e a disponibilidade de fitomassa dos estratos herbáceo, arbustivo e arbóreo, nos meses de março e junho. A avaliação da qualidade da forragem foi feita por meio da análise bromatológica, realizada em todos os meses do período chuvoso. Characterization of Caatinga vegetation and diet of steers in the "Sertão" of Pernambuco, BrazilAbstract -The objective of this work was to evaluate the botanical composition, the availability and quality of the fodder and diet of fistulated animals fed in an area of Caatinga, during the rainy season, in Pernambuco State, Brazil. Evaluations of botanical composition and fodder availability of herbaceous, arbustive and arboreous extracts were made in March and June. Fodder quality evaluation was performed through chemical analysis during the wet period. Sixty-seven species were found: 28 herbaceous, 20 arbustive and 18 arboreal; from these species, 19 were found in the animals diet. The fitomass availability from the herbaceous component varied from 1,369 kg ha -1 of dry matter (DM) in March, to 452 kg ha -1 of DM in June. The availability of the arbustive extract layer was close to the herbaceous, while the arboreal component contributed with only 178 kg ha -1 of DM. Despite the relatively high fitomass availability, only a small percentage was considered as fodder from the material found. It was observed a low digestion of the protein, probably due to high levels of lignin.Index terms: availability of forage, botanic composition, fodder quality. IntroduçãoCerca de 40% do globo terrestre está ocupado pelas florestas tropicais e subtropicais, entre as quais 42% são compreendidas pelas florestas secas, onde se inclui a Caatinga. Essas regiões são consideradas como o ecossistema mais explorado e degradado do mundo, pelo uso intensivo da terra. Caracterizada como floresta arbórea ou arbustiva, a Caatinga é composta de árvores e arbustos baixos com algumas características xerofíticas (Prado, 2003). Assim como as diversas matas secas tropicais, a vegetação da Caatinga também é alvo de grande exploração humana, pela atividade agrí-cola desenvolvida, pelo extrativismo na extração de madeira e lenha e pelo uso da pecuária extensiva.

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Section: Methodsunclassified

Caracterização da vegetação de Caatinga e da dieta de novilhos no Sertão de Pernambuco

Moreira

Lira

Santos

et al. 2006

Pesq. agropec. bras.

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“…Herbage mass (kg DM/ha) was estimated monthly by the comparative yield method (Haydock and Shaw, 1975). A continuous stocking method was applied throughout the year, and thus HA in each plot was adjusted monthly by the 'put-and-take method' (Mott, 1960).…”

Section: Location Animals and Experimental Designmentioning

confidence: 99%

Effects of herbage allowance of native grasslands in purebred and crossbred beef cows: metabolic, endocrine and hepatic gene expression profiles through the gestation–lactation cycle

Laporta

Astessiano

López-Mazz

et al. 2014

animal

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Our objective was to evaluate the metabolic, endocrine and hepatic mRNA profiles through the gestation-lactation cycle in purebred (PU: Angus and Hereford) and crossbred (CR: reciprocal F1 crosses) mutliparous beef cows (n = 32), grazing on two herbage allowances of native pastures (2.5 v. 4 kg dry matter/kg BW; LO v. HI) and their associations with cow's productive performance (calf birth weight, milk production and commencement of luteal activity). Cow BW, body condition score (BCS) and blood samples were collected monthly, starting at − 165 days relative to calving (days), and every 2 weeks after calving until +60 days of lactation. Liver biopsies were collected at − 165, − 75, − 45, − 15 ± 10, and +15 and +60 ± 3 days. Metabolic, endocrine and hepatic gene expression profiles, and calf birth weight, milk yield and postpartum commencement of luteal activity were evaluated. Overall, the most pronounced changes in metabolic, endocrine and hepatic gene expression occurred during winter gestation (−165 to − 45 days), when all cows experienced the onset of a negative energy balance (decreased BCS, glucose and insulin, and increased non-esterified fatty acid concentrations, P < 0.008). Concentrations of insulin and IGF-I were greater (P < 0.037) in HI than in LO cows. However, serum IGF-I concentrations and hepatic growth hormone receptor (GHR) and IGF1 mRNA decreased (P < 0.05) during the winter gestation period only in HI cows. Although IGF-I concentrations decreased (P < 0.05) during the early postpartum (−15 v. + 15 days) for all cows, the typical molecular mechanism that control the uncoupling of the growth hormone-IGF1 axis during the transition period of the dairy cattle (reduced hepatic GHR1A and IGF-I mRNA) was not observed in this study. The hepatic mRNA expression of key transcripts involved in gluconeogenesis and fatty-acid oxidation were upregulated (P < 0.05) during winter gestation (from − 165 to − 45, − 15 or +15 days, depending on the cow groups). Particularly, acyl-CoA oxidase-1 mRNA was greater for CR than for PU cows during winter gestation (−75 and − 45 days), and fibroblast growth factor-21 mRNA was downregulated (P < 0.01) only for HI cows during the transition (−15 v. 15 days) and lactation period (+15 to +60 days, P < 0.01). These results, together with the greater BCS, estimated energy intake, increased milk yield and shorter commencement of luteal activity in HI than in LO, and in CR than in PU cows (P < 0.018), would indicate that HI and CR cows were able to adapt more efficiently to changes in nutrient and energy supply through the gestation-lactation cycle.

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“…The herbage evaluations were carried out in those subdivisions assuming that those areas had similar vegetation and structure that the hole paddock. Thus, the herbage mass (HM) was measured using a visual standard comparison, calibrated with double sampling technique (HAYDOCK & SHAW, 1975), with 20 visual estimates and six cuts by subdivision at ground level, using a 0.25m² quadrat. In each cut two subsamples were separated, one to determine the dry matter (DM) content and other to determine leaves, stems (of grass), dead material and other species (than grass) dry matter contribution in the sward.…”

Section: Methodsmentioning

confidence: 99%

Beef heifers grazing behavior and herbage intake in natural grassland under rotational grazing

et al. 2015

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The comparative yield method for estimating dry matter yield of pasture

Cited by 336 publications

References 5 publications

Caracterização da vegetação de Caatinga e da dieta de novilhos no Sertão de Pernambuco

Caracterização da vegetação de Caatinga e da dieta de novilhos no Sertão de Pernambuco

Effects of herbage allowance of native grasslands in purebred and crossbred beef cows: metabolic, endocrine and hepatic gene expression profiles through the gestation–lactation cycle

Beef heifers grazing behavior and herbage intake in natural grassland under rotational grazing

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