INFLUENCE OF TEMPERATURE AND TURBIDITY ON CYANOBACTERIAL BLOOMS FROM ARGES RIVER, ROMANIA

This article presents the evolution of cyanobacterial abundance represented by Microcystis sp. and Aphanizomenon sp., in the period 2009-2017, on the river Arges, in Romania, as well as correlations with the temperatures and turbidities of water, in order to identify the impact of the actual climatic trends on the frequency and concentration of cyanobacteria. During this time interval it could be observed a change in the cyanobacterial blooming period by its moving in autumn, also the growth of its duration, but in the same time, a slight decrease a cyanovbacteria production during the whole year. The duration of cyanobacterial blooms season was positive correlated (+0.74) with the average annual temperature, and negative correlated (-0.71), with the turbidity in the season. The maximum concentration achieved by cyanobacteria showed negative correlation (-0.62) along with the turbidity recorded at the beginning of the cyanobacterial blooms season. Although temperature is a very important factor in cyanobacterial development in the Arges river, flood-induced turbidity plays a key role both in favoring or inhibiting its growth but also in adjusting temperatures

N-3 PUFA-ENRICHED HEMP SEED DIET MODIFIES BENEFICIALLY SOW MILK COMPOSITION AND PIGLETS’ PERFORMANCES

An experiment was conducted to evaluate the dietary hemp seed (HS) influence on sow milk composition and piglets’ performances. Ten sows were assigned randomly, to a control group (CL) with classical diets, and an experimental group (HSL) fed with 5% HS. Their litter (N=96) were divided in two groups: HH/CH with 1.5% HS and CC/HC without HS. The HS antioxidant activity was determined by DPPH method, phenolic compound by Folin–Ciocalteu, cannabinoid by colorimetry. Milk and colostrum samples from sow were collected manually. Gas chromatography was used to determine milk fatty acids (FA) composition. Colostrum and sow milk content of protein was determined by biuret reaction and lactose concentration was determined using phosphomolybdenic reagent. The lipid specimen was heated with concentrated sulfuric acid. Then vanillin and phosphoric acid are added to yield a pink coloured product which has been measured at 530 nm and quantified using a triolein standard. Milk yield (MY) was calculated. Average daily gain (ADG) of piglets at 0 to 7 d (days) was higher (P= 0.001) for HC/HH group and tended to be higher for HC/ HH group at 0-21 d. Milk yield calculated at peak lactation was > 2.1-fold in HSL group than in CL group. The diets tend to influence milk fat content, whereas the day had a significantly higher influence for protein and lactose. The n-3-rich diet favours milk deposition of α-linolenic FA (ALA), linoleic FA (LA) and total n-3 polyunsaturated FA (PUFA). This led to a significantly lower n-6:n-3 ratio in milk of HSL group. Docosahexaenoic FA (DHA) increased 1.87 and 2.33-fold at 0-7 d and 0-21 d in HSL group. We can conclude that HS altered beneficially milk FA associated with litter performance. Significantly positively correlated with MY, milk constituents declined in time