Czech Journal of Animal Science, 2012 (vol. 57), issue 12
Volume 57, Contents
Index Author
Czech J. Anim. Sci., 2012, 57(12):I-V | DOI: 10.17221/6416-CJAS 
Interaction between oviposition time, age, and environmental temperature and egg quality traits in laying hens and broiler breeders
E. Tůmová, R.M. Gous
Czech J. Anim. Sci., 2012, 57(12):541-549 | DOI: 10.17221/6411-CJAS
An experiment with laying hens and broiler breeders of two ages (young 22 vs. 36 weeks, old 83 vs. 64 weeks) and at temperatures of 20 and 28°C was carried out to evaluate the interactions between oviposition time (7:30; 11:30, and 15:30 h), age, and temperature on the one hand and egg quality on the other. A significant interaction (P ≤ 0.011) was determined in oviposition time. The highest number (25.8%) of eggs was laid at 7:30 h by young laying hens kept at 20°C and the lowest (3.7%) by young layers at 15:30 h kept in the same temperature. Time of oviposition was delayed by age and a higher temperature. Egg weight was significantly...
Effect of 2-methyl-2-phenoxy propionic acid on serum lipid profile and ovarian activity in dairy cows
A. Aparicio-Cecilio, J. Bouda, E.G. Salgado-Hernández, L. Núñez-Ochoa, D.A. Castillo-Mata, A. Gutiérrez-Chávez
Czech J. Anim. Sci., 2012, 57(12):550-556 | DOI: 10.17221/6412-CJAS
Hepatic lipidosis and ketosis are frequent metabolic disorders in dairy cows during the transition period. The 2-methyl-2-phenoxy propionic acid (MFPA) is an activator of energy metabolism. The objective of this study was to evaluate the effect of administration of MFPA 10 days prepartum to day 36 postpartum on serum lipid profile, ovarian reactivity, and milk yield. Fifty seven multiparous Holstein cows were divided into four groups. The groups 1 (n = 14) and 2 (n = 14) had body condition score (BCS) above 4; BCS of the groups 3 (n = 15) and 4 (n = 14) was between 3.25 and 3.75 at calving. The solution containing...
Allometric growth of calcium, phosphorus, magnesium, sodium, and potassium in slow- and fast-growing young chickens
J. Zelenka
Czech J. Anim. Sci., 2012, 57(12):557-561 | DOI: 10.17221/6413-CJAS
Allometric growth of body macrominerals was examined in slow-growing laying-type cockerels (SG) and in fast-growing male broiler hybrids (FG) during the growing period from hatch to day 22. Allometric coefficients for dry matter, calcium, phosphorus, magnesium, sodium, and potassium in relation to body weight were 1.091, 1.427, 1.383, 1.284, 0.843, and 1.097 for SG chickens and 1.075, 1.276, 1.233, 1.216, 0.943, and 1.144 for FG chickens, respectively. Allometric coefficients describing the relationships of Ca, P, Mg, Na, and K with dry matter weight were 1.302, 1.260, 1.172, 0.772, and 0.998 for SG chickens and 1.185, 1.143, 1.127, 0.878, and 1.059...
Ovarian follicle growth dynamics during the postpartum period in Holstein cows and effects of contemporary cyst occurrence
R. Rajmon, J. Šichtař, L. Vostrý, D. Řehák
Czech J. Anim. Sci., 2012, 57(12):562-572 | DOI: 10.17221/6414-CJAS
The indicators of follicle development with regard to the growth wave order, the first ovulation, animal parity, and also with regard to the simultaneous presence or absence of a follicular cyst were determined in cows in the course of 60 days postpartum. Follicular dynamics were monitored daily by ultrasonography. The animals were assigned to three groups based on the time of the 1st ovulation: G1 (n = 9) - the 1st dominant follicle (DF) ovulated, G2 (n = 10) - ovulation occurred on the 2nd or later follicular waves, and G3 (n = 5) - no ovulation occurred during the experimental period. G1...
Computed tomographic analysis of tibiotarsal bone mineral density and content in turkeys as influenced by age and sex
A. Charuta, R.G. Cooper, M. Pierzchała, J.O. Horbańczuk
Czech J. Anim. Sci., 2012, 57(12):573-580 | DOI: 10.17221/6415-CJAS
Changes in the volumetric bone mineral density (vBMD) and bone mineral content (BMC) of tibiotarsal bones of growing turkeys as affected by birds' age, sex, and within-the-bone location, respectively, were determined by computed tomography. The research was performed on 165 heavy-type BIG 6 turkeys reared between weeks (wk) 3-16 of age. The computed tomography (pQCT) measurement, conducted at 18 and 50% of the bone length, comprised a bone fragment which was 0.07 mm thick for the compact and the spongious substance collectively. It should be noted that the diaphyses of the tibiotarsal bones in turkeys (580 mg/cm3) had greater vBMD than the...