Abstract This study aimed to investigate the effects of dietary supplementation with modified-hen-egg-yolk on plasma lipids and lipoprotein profiles in rats. During the four-week-experiment, 64 Wistar rats were divided into four groups of 16 (eight of both sexes), and fed commercial rat food (group C); food containing 70% commercial rat mixture and 30% freshly cooked egg yolk originating from laying hen eggs fed with 3% fish oil (group F); 3% palm olein (group P), or 3% lard (group L). The cooked egg yolk in the rat diet affected the concentrations of plasma total and LDL-cholesterol in males of the P and L groups. Cholesterol and total fat in the diet did not have a hypercholesterolemic effect on their own, but when in combination with fatty acid composition, they could contribute to an increase in plasma total and LDL cholesterol concentrations in rats. HDL-cholesterol was the most resilient plasma lipoprotein of rats to dietary treatments in our experiment. Compared to the control group, the addition of hen egg yolk to the rat diet regardless of its quality, adversely affected the values of HDL-C/TC and HDL-C/LDL-C in both males and females.

Glandulla mammae is a secondary sexual characteristic. The composition and structure of the mammary gland depends on the functional state of the gland and is affected by hormones. The mammary gland reaches its full development during gestation and it becomes functional and secretory upon delivery. Lactocytes of the mammary gland may be squamous in shape, low or high prismatic, depending on the phase of the glandular cycle. Lactocytes are affected by LTH hormones due to which they are called prolactin. The function of the mammary gland is also affected by STH, and indirectly by TTH. Examined material was taken from Central Bosnia Canton, under field conditions of veterinary practice. The assay of histological features of the mammary gland of Dubska pramenka was conducted during the dry period as well as during lactation. The total number of animals was 16, eight (8) during the dry period and eight (8) during lactation period. Following the development of histological preparations, we conducted a descriptive overview - interpretation of the histological structures. The study of histological preparations of the mammary gland of Dubska pramenka during the dry period and lactation shows that the parenchyma is well developed, more or less, with reduced intersticium. Histological appereance of the lactocytes resembles that of the perifollicular tissue, the presence of different cells is higher during the lactation - the onset of glandural cycle. Well-developed lactiferous ducts with cavity, with or without secretion, but with preserved epithelium are the characteristics of both periods. The glandural tissue is well-developed and the secretion was present regardless of the examination period.

Pramenka je ovca kombiniranih svojstava, skromna u ishrani, vrlo otporna i dobro prilago ena našim uvjetima, ali slabih produktivnih osobina jer se uzgaja u brdsko-planinskim uvjetima, nepovoljnim za intenzivniju proizvodnju sto ne hrane, zbog ega je ishrana veoma esto kvantitativno i kvalitativno nedostatna. Na pravilnost ishrane ukazuje razina njihove proizvodnje, ali i njihov metaboli ki status koji se prosu uje odre ivanjem biokemijskih parametara krvi. Biokemijski parametri krvi mogu ukazati na energetsku, proteinsku i mineralnu opskrbu organizma, a istovremeno i na zdravstveni status životinje. Stoga smo proveli ispitivanje širokog spektra biokemijskih parametara u krvi ovaca s dva lokaliteta, op ine Livno i Travnik, u ljetnom razdoblju kada su životinje bile na ispaši karakteristi nog botani kog sastava navedenih podru ja, a sve s ciljem usporedbe sa standardnim vrijednostima parametara za ovce, ali i me usobnih podataka s dva razli ita podru ja. Krv je uzorkovana iz v. jugularis i u serumu su odre ivani sljede i biokemijski parametri: glukoza, Mg, P, Ca, ukupni proteini, LDH, GGT, AST, ALT, ALKP, kolesterol, trigliceridi, urea i albumini. Važnost istraživanja je u injenici da se prou avanjem metabili kog statusa unapre uju saznanja o interakciji lokalnog uzgoja i metabolizma ovce u funkciji održivosti autohtonih pasmina.