Organic Acids (BacterActive) spraying and dipping on hatching eggs were evaluated experimentally for their effect embryonic mortality, hatchability, chick quality, immunity, eggshell bacterial count. A total of 6300 broiler breeder (Ross-308) at age 58 weeks, collected divided to 7 treatments as follows: (T1: General Control, T2: Dipping Water, T3: Spray T4: water, T5: organic acid, T6:spray Ac...

The effect of acetylsalicylic acid (ASA) injected in ovo on the 18 d of incubation on the hatchability, course of hatching, and thyroid hormone concentrations (thyroxine (T4) and triiodothyronine (T3)) in the blood of chicks exposed to control (CON) or hyperthermic (HT) conditions during hatching were investigated. Eggs (n=540) from a broiler breeder flock were incubated under standard conditio...

Phosphorus (P) is essential for growth of all organisms, and P content correlated with in most taxa. Although was initially considered to be a trait fixed at the species level, there growing evidence considerable intraspecific variation. Selection on such variation can thus alter rates which fluxes through food webs. Nevertheless, prior work describing sources extent were not genetically explic...

MCKINDSEY, C.W., and MCLAUGHLIN, J.D. 1994. Transmission of Cyclocoelum mutabile (Digenea) to snails: the influence of temperature on the egg and miracidium. Can. J. Zool. 72: 1745 175 1. This study examined the survival and hatching dynamics of eggs of the digenean Cyclocoelum mutabile and the survivorship and infectivity of the miracidia under different temperature regimes. Hatching did not o...

The current study investigated the effect of short-term selection for four week body weight (BW) on performance of divergent lines of Japanese quail and their crosses. The mean of BW at hatching time, one, two, three and four week oldand BW at sexual maturity time, age at sexual maturity, number of eggs (from 50 to 100 days old), mean of egg weight, percentage of fertility and hatchability in e...

Pollution from agrochemicals may be contributing to the global decline of amphibian populations. Environmentally relevant concentrations of a fertiliser, ammonium nitrate, and a commercial formulation of the herbicide glyphosate Roundup Plus were tested on the embryonic development of Chioglossa lusitanica. This study introduces new data at three different levels. First, we provide previously u...

1. Countergradient variation in growth rate requires that rapid growth rate trades off with other performances, such that submaximal growth evolves in certain environments. Negative effects of rapid growth on other traits within a single ontogenetic stage are conspicuous candidates for such trade-offs, but trade-offs spanning ontogenetic stages have received much less attention. 2. We tested wh...