This paper presents results of determination of certain quality parameters and its phenotypic correlation in eggs originated from extensively reared gray variety of Guinea fowl. A total of 150 egg collected by sampling 30 eggs in each of five analyzed laying months were used for egg quality evaluation and statistical analysis by methods of descriptive statistics and simple linear correlation. Average egg weight, shape index and shell thickness was 38.14 g, 76.03% and 0.49 mm, respectively.

Summary In order to determine phenotypic correlations between the quality traits of eggs from 41-week-old broiler breeder hens (Cobb 500), a total of 105 eggs suitable for incubation were analyzed using descriptive statistics and Pearson’s correlation coefficient. The average values of egg weight, egg length, egg width, egg shape index, shell thickness, shell weight, and shell ratio were 66.90 g, 60.00 mm, 44.81 mm, 74.70%, 0.37 mm, 6.07 g, and 9.07%, respectively. Moreover, the average values of yolk weight, albumen weight, yolk ratio, albumen ratio, Haugh units, yolk index, and yolk-to-albumen ratio were 20.04 g, 40.80 g, 29.97%, 60.95%, 82.12, 46.17%, and 0.49, respectively. A significant positive correlation (p < 0.01) was found between the egg weight and the egg length (0.75), egg width (0.80), shell (0.55), yolk (0.60), albumen weight (0.91), and albumen ratio (0.25). However, a significant negative correlation (p < 0.01) was found between the egg weight and both the yolk ratio (-0.20) and yolk-to-albumen ratio (-0.23). The egg shape index proved not to be significantly correlated with any of the internal egg quality traits considered. The shell thickness was in a significant positive correlation (p < 0.01) with the shell weight (0.83) and ratio (0.86), whereas a significant negative correlation (p < 0.05) was found between the shell thickness and yolk ratio (-0.23). The Haugh units were in a significant positive correlation (p < 0.05) with the albumen ratio (0.24) and yolk index (0.27), whereas a significant negative correlation (p<0.05) was found between the Haugh units and both the yolk ratio (-0.22) and yolk-to-albumen ratio (-0.23). The results obtained confirm significant phenotypic correlations not only between egg weight and the egg quality traits considered, but also between a number of external and internal quality traits of broiler hatching eggs.

This paper presents the values of blood biochemical parameters of Simmental cows (n = 60), divided into five groups (dry cows, early puerperium, late puerperium, the fifth month of lactation, and cows with an extended service period). The ration for lactating cows contained an insufficient amount of dry matter, a third less than the lower limit of their requirements. In all examined groups of cows, a strong protein deficiency and excess calcium was found in the diet. Total protein concentration in all groups of cows were on the upper physiological limit, and the concentrations of bilirubin, carotene, vitamin A and total lipids were within the normal range. Low concentrations of urea in the third, fourth and fifth group of cows (3.1±0.39 mmol/l, 2.9±0.38 mmol/l and 3.3±0.43 mmol/l, respectively) indicate the imbalance of protein and energy in the diet. The presence of an energy deficit is also indicated by the low blood glucose in all groups of cows, especially the second and fifth groups of cows (2.2±0.04 mmol/l and 2.3±0.07 mmol/l, respectively). The unfavorable ratio of calcium and phosphorus in the diet resulted in the narrowing of the calcium:phosporus ratio in blood serum, which is particularly evident in cows with an extended service period (2.1±0.07 mmol/l compared to 1.9± 0.11 mmol/l). Based on these results,we conclude that the tested herd exhibits subclinical health disorders, caused by an inadequate diet and with adverse effects on the productive and reproductive parameters

The aim of this study is to give an overview of the production and management of animal waste in the Republic of Serbia, and to emphasize the importance of this issue and its proper solution. Disposal of animal waste is a significant prophylactic measure, aimed at detecting, preventing, suppressing and eradicating infectious and parasitic diseases in humans and animals. The process of animal waste disposal starts from the manufacturer, who is responsible for ensuring safe storage of waste in a cooling unit, until its final removal in the processing plant. Disposal of animal waste must be done in a safe way otherwise dangerous pathogens can be spread by water, air and soil and can endanger the health of the population. In the European Union, and the Republic of Serbia accordingly, the legislation was introduced regulating the ways of managing animal waste, categorizing hazardous waste and ways to its secure resolving, with member states obliged to respect and apply the methods of safe handling of by-products of animal origin.

10 9 spermatozoa in the same volume (83.3%) or with insemination by doses of 100 mL with a 2 × 10 9 (83.3%) or a 4 × 10 9 sperm count (86.7%). The number of live-born piglets (10.82) was larger following IUI using a 50 mL volume dose with a 2 × 10 9 sperm count as compared with ICI with the same AI dose volume and sperm count (9.85). The results show that the use of reduced AI dosages provides an opportunity for the swine industry to considerably exploit the reproductive potential of genetically superior boars.