42 resultados para Short cycle


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Pós-graduação em Agronomia (Energia na Agricultura) - FCA

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Pós-graduação em Agronomia (Energia na Agricultura) - FCA

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Agronomia (Agricultura) - FCA

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Pós-graduação em Agronomia (Produção Vegetal) - FCAV

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The crambe is a brassica with high content of oil used for biodiesel production and that has aroused interest in the short cycle and low production cost. However, there are doubts about their response to phosphated fertilization. The objective of this study was to evaluate the effect of different doses of phosphorus on yield, physiological quality, chemical composition and oil content of crambe seeds. The treatments consisted of five doses of phosphorus (0, 25, 50, 75 and 100 kg ha(-1)) applied at sowing. There was no effect of phosphorus on mineral composition and oil content of the seeds of crambe that showed the following averages: 30.11 N, 7.46 P, 7.35 K, Ca 10.06, 6.58 mg and 8.98 g kg(-1) S; 36.25 Cu, Fe 169.40, 36.75 Mn 73.60 mg kg(-1) Zn and 30.22% oil. It was concluded that the productivity of crambe increases with phosphorus rates of up to 100 kg ha(-1), but its use does not affect the survival rate of plants, dry mass, the mass of thousand seeds, the physiological quality, chemical composition and oil content of the seed.

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The prolonged postpartum anoestrus in cows reduces the number of calves leading to a significant economic loss to producers. Suckling and nutrition are the factors of great importance to the extension of the post-partum period. Besides, the occurrence of short cycles within 30 to 40 days postpartum contributes to an increase in the parturition–conception interval. These cycles are related to development of a corpus luteum with reduced duration after the first ovulation (less than 12 days). It is known that the short persistence of the corpus luteum is caused by advance of the luteolytic mechanisms. However, there is a lack of consensus regarding the cause of this anticipation. There are two currently accepted hypotheses, one related to the lack of prior exposure to progesterone, and the other related to the low concentration of pre-ovulatory estrogen. Considering the decrease in the incidence of short cycles in cows treated with progesterone and estrogen, the main protocols of ovulation induction include combination of both hormones. Therefore, this study aimed at describing the post-partum anestrous in cows and the main predisposing factors, emphasizing the first postpartum ovulation, short cycle and, its respective causes and consequences

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Pós-graduação em Agronomia (Produção Vegetal) - FCAV

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Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

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Pós-graduação em Agronomia (Agricultura) - FCA