ISSN 2285-5750, ISSN CD-ROM 2285-5769, ISSN-L 2285-5750, ISSN Online: 2393 – 2260
 

Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 1
Written by Stefan-Mihai PETREA, Alina MOGODAN, Ira-Adeline SIMIONOV, Aurelia NICA, Daniela Ancuța ȘARPE, Victor CRISTEA

In order to assure high financial sustainability of intensive sturgeon aquaculture, a proper feeding rate must be identified for different stages of growth. Therefore, the present study aims to evaluate the effect of two different feeding rates (F1 - 1% biomass weight BW, respectively F2 - 2% BW) on growth performance of A. stellatus, with a mean individual biomass of 201.7±32.82 g, reared in intensive conditions. The F2 experimental variant register, overall, a better feeding efficiency, revealed by feed conversion rate (FCR) average value (1.02 g feed/g biomass gain), compared to F1 (1.28 g feed/g biomass gain). Also, the sturgeon exemplars from F2 experimental variant manifested, overall, a superior ability of using feed protein for growth (higher average protein efficiency ratio - PER: 2.39 g/g), compared to F1 (PER: 1.95 g/g). The feeding rate applied at F2 assures the maximization of sturgeon production quantity, emphasized by the higher overall values of average specific growth rate (SGR: 1.74% BW/day at F2, compared to 0.78% BW/day at F1). The biomass and length coefficients of variation (CVw, respectively CVL) indicate, for both experimental variants, a high homogeneity degree of stellate sturgeon experimental population (CVw: 16.51% at F1 and 12.53% at F2, respectively CVL: 5.29% at F1 and 4.43% at F2, both registered at the end of the experiment). Therefore, it is recommended to apply 2% feeding rate in order to assure a better efficiency of sturgeons rearing technology, during the analyzed growth stage.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXII, Issue 2
Written by Muzaffer DENLI, Aydin VURAL, Simten YESILMEN ALP

The aim of this study was to determine the effects of adding oregano essential oils (OEO) to diets on egg quality and egg shell contamination of laying hens kept in furnished cages. For this aim 300 Atak-S at 31 weeks old laying hens were randomly divided into two groups negative control (NC; basal diet) and oregano essential oils (OEO; basal diets plus 150 mg/kg oregano essential oils) for 6 months. Dietary inclusion of OEO significantly decreased E.coli and Coliform contamination on egg shell (P<0.05). In addition, including diet with OEO improved means of egg weight comparing to the control (P<0.05). However, no significant differences in the internal quality characteristics of eggs were observed between two groups during the all experimental period (P>0.05). Results of the study indicated that the adding OEO to diets plays an important role in decreasing egg shell bacterial contamination.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Anca Nicoleta CORDELI (SĂVESCU), Lucian OPREA, Mirela CREȚU, Mihaela MOCANU

To determine the influence of stocking density on the common carp growth performance and body composition, four variants: 0.9 kg m-3 (V1), 1.8 kg m-3 (V2), 2.6 kg m-3 (V3), and 3.5 kg m-3 (V4) was carried out during 31 days. In this context, 2100 common carp fry, with an initial weight of 1.8 g fish-1, were maintained in twelve rearing units of a recirculating aquaculture system. Fish were fed three times per day with extruded feed containing 50% crude protein and 14% fat. At the end of the experiment, the fish's growth performance was assessed. Better results were obtained for the V1 variant. Regarding the biochemical composition of fish meat, significant differences (p˂0.05) were recorded in the water content, while the ash lipids and protein content showed no significant differences (p˃0.05) between the experimental variants. Therefore, it can be concluded that a stocking density of 0.9 kg m-3 is optimal for rearing juveniles of common carp without compromising the specific growth rate (SGR), survival, and biochemical composition of fish meat.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 2
Written by Aurelia NICA, Alina MOGODAN, Ira-Adeline SIMIONOV, Stefan-Mihai PETREA, Victor CRISTEA

The identification of suitable fish stocking density proves to be essential in order to elaborate a sustainable fish rearing technology. The aim of present study is to identify a proper stocking density for juvenile ornamental carp, that maximizes the productivity of this specie, in semi-intensive aquaculture production systems. Thus, two ornamental carp stocking densities were tested, in duplicate (V1 – 6.3 kg/m3, respectively V2 – 7.01 kg/m3). The results indicate a better feed conversion ratio (FCR) in case of V1, compared to V2. Also, V1 registered higher specific growth rate (SGR) values and a better protein efficiency ratio (PER). However, in order to maintain the technological water quality within the optimum range for rearing ornamental carp, a higher water exchange rate was applied at V2, compared to V1, especially in the first part of the experimental period. The FCR registered better values in the first part (1.5% feeding ratio was applied), compared to the second part of the experimental period (1% feeding ratio). However, if production maximization is required, higher ornamental carp stocking densities and feeding ratio can be applied if water quality module will be improved.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Ionut Alexandru ANIN, Elena Narcisa POGURSCHI, Iuliana MARIN, Dana POPA, Livia VIDU, Carmen Georgeta NICOLAE

Fish is an important part of human nutrition, with high biological value, easily digestible, without unfavourable effects to human health. Fish consumption is expected to increase by at least 20% in the next years. Increasing the amount of fish meat can be achieved by intensive aquaculture. The current paper presents a comparative analysis of the results obtained in the intensive growth in floating cages of juvenile carp intended for human consumption at different growth densities. As a result of the experiment, fish that grow at a density of less than 15 kg/m3 have a lower feed conversion ratio and a higher weekly average growth rate than carp raised at a density higher than 15 kg/m3.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Victoria BOGDAN, Valeria VRABIE, Valentina CIOCHINĂ

The action of food rations on the process of multiplication and development of intestinal enterococci was tested in order to highlight their influence on the health of the intestinal tract. In the study were used four food rations with various caloric structure tested on laboratory animals - white rats, Wistar line. It was established that all the investigated rations differentially influenced the multiplication and development of enterococci. Based on the obtained results, it can be stated that the quantitative indices of enterococci, to a large extent, depend on the composition of food rations. Therefore, we consider that their numerical value can be regulated and maintained not only by microbial preparations with probiotic action but also by the use of food rations, which reflect the prebiotic influence of intestinal enterococci.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 1
Written by Andrei MARMANDIU, Marinela PRIOTEASA, Răzvan DOBRE, Carmina MARMANDIU, Ion RĂDUCUŢĂ, Ion CUSTURĂ

The purpose of the present research was to analyze comparatively the productive performances of the Lohmann Brown Classic hybrid hens, kept in batteries with cages and on the ground, on permanent bedding. During the exploitation period (85 weeks in cages, 93 weeks on the ground), was monitored: intensity of egg laying, the dynamics of the production of eggs, egg weight, feeds consumption and the evolution of the body weight of hens. The hens grown in cages achieved superior productivity performances, in comparison to the ground grown hens: average egg laying intensity 87.83% versus 79.61%; average number of eggs at the age of 16 months 417.79 versus 349.23; the average egg weight 68.45 g versus 64.57 g; average body weight of hens 1947.65 g versus 1932.85 g. The daily consumption of feeds per bird varied between 124-171 g in the case of caged hens and between 130-150 g for the ground grown hens.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Dana POPA, Monica MARIN, Elena POGURSCHI, Tomița DRĂGOTOIU, Răzvan POPA, Mihaela BĂLĂNESCU, Georgeta DINIȚĂ

The aim of the research undertaken was to highlight that emission reductions can be made available to producers in the steer farming sector and the adoption of current best practices and technologies for the rearing and health of animals, feed rations can be a tool that would help the dragline sector reduce greenhouse gases, and was realized on the Moara Domneasca farm on a flock of 27 dairy cows at different stages of Montbeliarde’s lactation between November 2019 and September 2020. Daily milk production was establised per lactation cycle, within the lactation cycle of 3 distinct stages and the establishment of two seasons, summer and winter. The influence of feed strategies applied on milk production, manure chemical composition and CH4 and CO2 emissions were analyzed. The dairy production of the cows varied in the management of green feed rations between 21.97 L/head in the upward stage of lactation and 20.54 L/head in the plateau phase and in winter succulent rations, milk production was 21.29 L/head in the ascending phase, 19.93-20.27 L/head in the plateau phase and 18.56 L/head in the ascending phase. The methane emission from enteric fermentation has the highest values for the variants 6 and 4, which contains rots (sunflower and soybean), maize, and wheat bran and the lowest emissions are recorded for the ration variant 1 which is rich in green fodder.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 1
Written by Paul Rareş ARSINTE, Gabriel Vasile HOHA, Cătălin Emilian NISTOR, Vasile BĂCILĂ, Gherasim NACU, Benone PĂSĂRIN

The purpose of the paper is to highlight the reproductive performance obtained in a pig farm in Denmark following the treatment of sows with a hormonal preparation used to synchronize oestrus. The research involved the study of 105 YL (Yorkshire x Landrace) cross-breed females, all between the ages of 28 and 30 weeks, weighing between 100 and 120 kg, exploited for the production of bacon. The following indicators were followed: fertility, index of use of sows for reproduction, prolificacy, number of piglets weaned on female and piglets’ mortality. The obtained results showed higher values for all the indicators analysed at the batch treated with the hormonal preparation compared to the control group (fertility 94.99 vs 91.66%; the index of use of sows for reproduction 2.47 vs 2.29; prolificacy 16.7 vs 15.6 piglets; number of weaned piglets on female 15.7 vs 15 piglets). The results of the study demonstrate that hormone treatment in sows leads to improvement of reproduction indicators in sows.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXII, Issue 1
Written by Heidy MANANGKOT, Marie NAJOAN, Wisje TOAR, Merry ROTINSULU, Santi TURANGAN

The aims of this research were to evaluate the utilization of manure degraded by Hermetia illucens to be used as diets on blood lipid profile of native chicken. The treatments were R1 (control diet with 15% fish meal + 0% MBHI meal), R2 (diet with 10% fish meal + 5% MBHI meal), R3 (diet with 5% fish meal + 10%MBHI meal), and R4 (diet with 0% fish meal + 15% MBHI meal). The data were analyzed using analysis of variance according to Completely Randomized Design (CRD) and means separated by the application of Duncan’s multiple range test. Variables measured were triglyceride, LDL, HDL, and cholesterol. The results shown that R3 gave a significant (P<0.05) lower in triglyceride (47,15 -59,66 mg/dl), LDL (45,68 – 81,06 mg/dl),cholesterol (124,98 -155,97 mg/dl) Whereas, R3 gave HDL (75,85 – 86,28 mg/dl) level significantly higher (P < 0.05). High blood HDL level at 10% MBHI meal in the diet not only maintains blood HDL at normal level but also increases native chicken meat quality, as was expected in the present study.

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© 2019 SCIENTIFIC PAPERS. SERIES D. ANIMAL SCIENCE. To be cited: SCIENTIFIC PAPERS. SERIES D. ANIMAL SCIENCE.

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