Dietary Phytoncide Supplementation Improved Growth Performance and Meat Quality of Finishing Pigs
We conducted this 10-wk experiment to evaluate the effects of dietary phytoncide, Korean pine extract as phytogenic feed additive (PFA), on growth performance, blood characteristics, and meat quality in finishing pigs. A total of 160 pigs ([Landrace×Yorkshire]×Duroc, body weight (BW) = 58.2±1.0 kg) were randomly allocated into 1 of 4 treatments according to their BW and sex, 10 replicate pens per treatment with 4 pigs per pen were used (2 barrows and 2 gilts). Dietary treatments were: CON, control diet; PT2, CON+0.02% PFA; PT4, CON+0.04% PFA; PT6, CON+0.06% PFA. Overall, average daily gain (ADG) was higher in PT4 (p<0.05) than in PT6, average daily feed intake (ADFI) was lower in PT6 than in CON (p<0.05). Besides ADFI decreased linearly (p<0.05) with the increased level of phytoncide and gain:feed ratio in PT4 treatment was higher (p<0.05) than CON treatment. During 5 to 10 weeks and overall, quadratic (p<0.05) effect was observed in ADG among the treatments. At the end of this experiment, pigs fed with PT4 diet had a greater (p<0.05) red blood cell concentration compared to the pigs fed CON diet. Water holding capacity increased linearly (p<0.05) with the increased level of phytoncide supplementation. Moreover, firmness, redness, yellowness, and drip loss at day 3 decreased linearly (p<0.05) with the increase in the level of phytoncide supplementation. In conclusion, inclusion of phytoncide could enhance growth performance without any adverse effects on meat quality in finishing pigs.
Phytogenics in Aquaculture: A Short Review of Their Effects on Gut Health and Microflora in Fish
Increasing pace in aquaculture development to meet the growing food requirements of the population has greatly compromised the carrying capacity of the culture environment and has placed the aquacultured animals at heightened risk of getting diseases due to pathogens. At present, chemotherapy is widely used as means to prevent or treat infectious diseases in aquaculture; however, the use of these drugs poses multiple negative impacts on fish and human health, as well as the environment. Recently, research initiatives are focused on the use of plant products and their derivatives as a means of controlling diseases in aquaculture. They are regarded as a promising alternative to the use of chemical treatments for infectious diseases in fish. Plant-derived products or phytogenics have been shown to stimulate appetite and promote weight gain in farmed animals, act as immunostimulants, and possess potent anti-pathogenic properties in fish. Their potency is mediated by the presence of bioactive molecules including alkaloids, terpenoids, saponins, and flavonoids, among others. Moreover, nutritional strategies are geared towards the use of these phytogenics in modulating immune and physiological responses, as well as promoting optimum health and microbial community in the gastrointestinal tract of fish. This review synthesizes the current knowledge on the use of phytogenic feed additives in aquaculture by focusing on how these substances act as modulators of health and bacterial community in the gut of fish.
Reid on Hypotheses and the Ether; A Reassessment
In recent years historians of science have come to see that Thomas Reid’s Essays on the Intellectual Powers of Man had a profound impact on the development of British methodological thought in the late-eighteenth and early-nineteenth centuries. Larry Laudan has argued that Reid was “the first major British philosopher to take Newton’s opinions on induction, causality, and hypotheses seriously”; and that Reid was thereby instrumental in changing the character of British methodological discourse in the Enlightenment.(1) Geoffrey Cantor has examined in detail the influence of Reid’s critique of ether theories and hypotheses in the Essays on leading protagonists in the nineteenth-century debates surrounding the wave theory of light,(2) and Richard Olson has traced the origins of the scientific style of British physics in the Victorian period to the writings of Reid and other Common Sense philosophers. (3) As well as delineating Reid’s influence, Laudan, Cantor, and Olson have attempted to identify the problems to which he addressed himself in articulating his methodology, and they have analysed with some care the internal structure of his methodological views. Thanks to the work of these historians, therefore, we have a fairly comprehensive picture of Reid’s methodology and its fortunes in the nineteenth century.