Nutritional divergence in genotypes of forage peanut

Abstract

-The objective of this study was to evaluate the nutritional divergence between ten genotypes of forage peanut, based on chemical composition as well as fermentation and in vitro degradation kinetic characteristics. Treatments consisted of ten genotypes of Arachis pintoi, namely eight accessions (31135, 30333, 15121, 31828, 15598, 31534, 13251 and 31496) and two cultivars (cv. Belmonte and cv. Amarillo). The genotypes were harvested in each plot at a height of 3 cm from the ground, in 42-day intervals, during the time of heaviest rainfall. For the multivariate analysis the following variables, the following were used: crude protein, neutral detergent fiber, potential degradation in 48 hours, degradation rate of insoluble potentially degradable fraction and degradation rate of non-fibrous carbohydrate. The application of the hierarchical clustering analysis, using the Euclidian distances matrix of standardized averages allowed for the identification of five homogeneous groups. Among them, the accessions 31828, 31534, 15121 and cv. Belmonte stood out nutritionally among the remaining genotypes evaluated, depicting as promising for the utilization in ruminant feeding.

Method to generate growth and degrowth models obtained from combinations of existing models applied to agrarian sciences

“…Colonization times (λ) ranged from 4.40 h for G2 to 5.46 h for G3. [6] fitted model LB to ten genotypes of Arachis pintoi and found similar λ values as those obtained in the present study at 4.4 to 5.5 h. Lower values were found by [7] for the Arachis pintoi cultivars assessed, from 2.8 to 4.3 h. Considering all genotypes, estimates and for model LB were higher and lower, 1 2 respectively, than estimates and for model VGB. The final gas volume W(t) is produced by 1 2 the rapid-and slow-digestion fractions, i.e., the sum of NCF and FC.…”

“…Those authors reported values of 0.095 (0.04), 0.108 (0.04), 0.131 (0.04), 0.203 (0.04), 0.216 (0.04), and 0.222 (0.04) for silages of corn, alfalfa hay, sorghum, sugar cane, Coastcross hay, and Tifton-85, grass, respectively. The estimated degradation rates k 1 and k 2 by model LB were similar to those found by [6,7] for pinto peanut genotypes. Another relevant piece of information is that for the models fitted considering all genotypes (Table 3).…”

“…The DM content at 105 °C was determined by drying until constant weight, crude protein (CP) and acid detergent insoluble protein (ADIP) were defined using the Kjeldahl method according to the AOAC [1], and neutral detergent fiber (NDF) and acid detergent fiber (ADF) were determined according to [31]. Gas production was read at 2,4,6,8,10,12,14,17,20,24,28,32,48,72, and 96 h after the start of the in vitro fermentation process at the Federal University of Minas Gerais (UFMG) according to the equation proposed by [15].…”

Generation of models from existing models composition: An application to agrarian sciences

“…Colonization times ( λ ) ranged from 4.40 h for G2 to 5.46 h for G3. [24] fitted model LB to ten genotypes of Arachis pintoi and found similar λ values as those obtained in the present study at 4.4 to 5.5 h. Lower values were found by [25] for the Arachis pintoi cultivars assessed, from 2.8 to 4.3 h and [26] variation from 3.4 to 4.0 h to evaluate sunflower and corn silage, individually and with different proportions. Highest values were related by [27] for Brachiaria brizantha ranging from (12.9 to 14.6 h), and by [1] in Mulato II grass under nitrogen adubation with doses and different sources this element (6.73 to 9.51 h).…”

Estrutura do pasto e taxa de consumo de forragem de amendoim forrageiro (Arachis pintoi Krapovickas & Gregory cv. Belmonte) submetido a intensidades de pastejo

“…Belmonte com gramíneas forrageiras tem proporcionado ganhos em produtividade (ANDRADE et al, 2012;SILVA, 2008) e em rentabilidade (OLIVEIRA, 2007). Ferreira et al (2012) avaliaram o valor nutritivo de dez genótipos (31135, 30333, 15121, 31828, 15598, 31534, 13251 e 31496) e dois cultivares de amendoim forrageiro (Belmonte e Amarillo). Nesse trabalho, o Belmonte se mostrou superior ao Amarillo, tendo apresentado 16,2% de MS, 23,5% de PB, 53% de FDN e 51,3% de digestibilidade, destacando-se como alternativa promissora para a utilização na alimentação de ruminantes.…”