ABSTRACT
Jiggs bermudagrass has presented competitive production potential over other forages. However, there is a lack of information about the nutritional value of this forage with important relevance in ruminant nutrition. This study aimed to evaluate the protein and carbohydrate fractionation of Jiggs bermudagrass in different seasons of the year under intermittent grazing by Holstein cows. The experiment was conducted during one year in a completely randomized design with nine replications and treatments consisted of the effect of four seasons: fall, winter, spring and summer. The results showed that there were seasonal variations in the fractions of proteins and carbohydrate, with the exception of the protein fraction B3. The better climatic conditions in spring and summer contributed to an increase in the protein fraction A and carbohydrate A+B1. The winter had a greater fraction C of protein and carbohydrate, reflecting the nutritive value of the forage. The use of irrigation during fall and winter had a positive effect on nitrogen fractions B1 and B2 and on non-fiber carbohydrates.(AU)
Subject(s)
Cynodon/chemistry , Cynodon/cytology , Cattle/metabolism , Pasture/analysis , Climatic ProcessesABSTRACT
Jiggs bermudagrass has presented competitive production potential over other forages. However, there is a lack of information about the nutritional value of this forage with important relevance in ruminant nutrition. This study aimed to evaluate the protein and carbohydrate fractionation of Jiggs bermudagrass in different seasons of the year under intermittent grazing by Holstein cows. The experiment was conducted during one year in a completely randomized design with nine replications and treatments consisted of the effect of four seasons: fall, winter, spring and summer. The results showed that there were seasonal variations in the fractions of proteins and carbohydrate, with the exception of the protein fraction B3. The better climatic conditions in spring and summer contributed to an increase in the protein fraction A and carbohydrate A+B1. The winter had a greater fraction C of protein and carbohydrate, reflecting the nutritive value of the forage. The use of irrigation during fall and winter had a positive effect on nitrogen fractions B1 and B2 and on non-fiber carbohydrates.
Subject(s)
Cattle/metabolism , Cynodon/cytology , Cynodon/chemistry , Pasture/analysis , Climatic ProcessesABSTRACT
The objective of this study was to evaluate the effect of the presence of forage peanut (Arachis pintoi Krap. and Greg.) on the morphogenesis characteristics of two cultivars of Cynodon (Tifton 85 and Coastcross-1). The experimental design was factorial (three factors), in randomized blocks, having as factors the cultivars (2), the occupancy area of forage peanut (4) and the seasons (3), with three replications, established in plots. There were three assessments during the study, in spring, summer and autumn, in which the total number of tillers, the culm and leaf elongation, the senescence rate and leaf emergence, the phyllochron, the leaf lifespan, the leaf number and the height of culm and canopy were evaluated. The number of green leaves, number of elongating leaves and senescence rate were similar among cultivars, but cv. Coastcross-1 showed higher number of expanded leaves and leaf emergence rate, and lower phyllochron and leaf lifespan. We observed lower rates of senescence and higher leaf emergence in spring, and lower rates of leaf elongation in autumn. The increasing participation of forage peanut in the pastures did not affect the calculated morphogenetic variables, but decreased the number of grass tillers. A lower average daily thermal accumulation decreased the development of both grasses in this study, with a more pronounced effect in cv. Tifton 85. The Coastcros...
O objetivo deste trabalho foi avaliar a presença do amendoim forrageiro (Arachis pintoi Krap. e Greg.) sobre as características morfogênicas de duas cv.es do gênero Cynodon (Tifton 85 e Coastcross-1). O delineamento experimental utilizado foi em fatorial distribuído em blocos ao acaso, apresentando como fatores as cultivares (2), a oportunização de área para o amendoim forrageiro no plantio das pastagens (4) e as estações estudadas (3), com três repetições, sendo estabelecidas em parcelas. Realizaram-se três avaliações no decorrer do estudo, caracterizando as estações de primavera, verão e outono, sendo avaliado o número total de perfilhos, alongamento de colmo e folhas, taxa de senescência e aparecimento de folhas, filocrono, duração de vida da folha, número de folhas e altura de colmo e de dossel. O número de folhas verdes, folhas em crescimento e a taxa de senescência foram similares entre as cultivares estudadas, porém, a cv. Coastcross-1 apresentou maior número de folhas expandidas e taxa de aparecimento foliar e menor filocrono e tempo de vida de folha. Na estação da primavera verificaram-se menores taxas de senescência e maiores de aparecimento de folha, enquanto no outono foram observadas menores taxas de alongamento foliar. A participação crescente de amendoim forrageiro nas pastagens não alterou as variáveis morfogênicas calculadas, no entanto diminuiu o número de...
Subject(s)
Arachis/chemistry , Cynodon/anatomy & histology , Cynodon/cytology , Pasture/analysisABSTRACT
The objective of this study was to evaluate the effect of the presence of forage peanut (Arachis pintoi Krap. and Greg.) on the morphogenesis characteristics of two cultivars of Cynodon (Tifton 85 and Coastcross-1). The experimental design was factorial (three factors), in randomized blocks, having as factors the cultivars (2), the occupancy area of forage peanut (4) and the seasons (3), with three replications, established in plots. There were three assessments during the study, in spring, summer and autumn, in which the total number of tillers, the culm and leaf elongation, the senescence rate and leaf emergence, the phyllochron, the leaf lifespan, the leaf number and the height of culm and canopy were evaluated. The number of green leaves, number of elongating leaves and senescence rate were similar among cultivars, but cv. Coastcross-1 showed higher number of expanded leaves and leaf emergence rate, and lower phyllochron and leaf lifespan. We observed lower rates of senescence and higher leaf emergence in spring, and lower rates of leaf elongation in autumn. The increasing participation of forage peanut in the pastures did not affect the calculated morphogenetic variables, but decreased the number of grass tillers. A lower average daily thermal accumulation decreased the development of both grasses in this study, with a more pronounced effect in cv. Tifton 85. The Coastcros...(AU)
O objetivo deste trabalho foi avaliar a presença do amendoim forrageiro (Arachis pintoi Krap. e Greg.) sobre as características morfogênicas de duas cv.es do gênero Cynodon (Tifton 85 e Coastcross-1). O delineamento experimental utilizado foi em fatorial distribuído em blocos ao acaso, apresentando como fatores as cultivares (2), a oportunização de área para o amendoim forrageiro no plantio das pastagens (4) e as estações estudadas (3), com três repetições, sendo estabelecidas em parcelas. Realizaram-se três avaliações no decorrer do estudo, caracterizando as estações de primavera, verão e outono, sendo avaliado o número total de perfilhos, alongamento de colmo e folhas, taxa de senescência e aparecimento de folhas, filocrono, duração de vida da folha, número de folhas e altura de colmo e de dossel. O número de folhas verdes, folhas em crescimento e a taxa de senescência foram similares entre as cultivares estudadas, porém, a cv. Coastcross-1 apresentou maior número de folhas expandidas e taxa de aparecimento foliar e menor filocrono e tempo de vida de folha. Na estação da primavera verificaram-se menores taxas de senescência e maiores de aparecimento de folha, enquanto no outono foram observadas menores taxas de alongamento foliar. A participação crescente de amendoim forrageiro nas pastagens não alterou as variáveis morfogênicas calculadas, no entanto diminuiu o número de...(AU)