Straková E., P. Suchý, M. Šugerková, M. Macháček: Positive Effect of Plant-Based Diet on the Performance and Health of Laying Hens. acta vet. Brno 2007, 76: S31-S37. an entirely plant-based feed mixture was prepared to minimize the potential risk of transmitting prion infections through animal feed. It consisted of two protein components (soya extracted meal and lupin seed meal) and was compare...

I . Pooled samples of eggs from White Leghorn and New Hampshire hens given diets containing 110 and zoo g protein/kg were analysed for their content of essential amino acids. 2. The amino acid composition of the hen’s egg protein was not significantly affected by variations in breed and diet. 3. The estimated values for lysine, total sulphur-containing amino acids and tryptophan in egg protein ...

Eberhard, William G. The Ecology and Behavior of a Subsocial Pentatomid Bug and Two Scelionid Wasps: Strategy and Counterstrategy in a Host and Its Parasites. Smithsonian Contributions to Zoology, number 205, 39 pages, 13 figures, 24 tables, 1975.—The tropical bug Antiteuchus tripterus and two parasites of its eggs, Trissolcus bodkini and Phanuropsis semiflaviventris, were studied in urban Cali...

Whether androgen deposition in eggs is physiologically costly for female birds has remained a crucial but unsolved question, despite a broad use of this assumption in functional studies. We tested whether females depositing high androgen concentrations experienced higher mass losses than females depositing low androgen concentrations. Analysing female body mass change during egg formation in ro...

1. We used published data to investigate the combined influence of egg size and incubation temperature on embryonic development time for a broad assortment of aquatic insects at four different incubation temperatures (10, 15, 20 and 25 °C). 2. Embryonic development time (EDT) was positively correlated with egg size at each of the four temperatures, but with different relationships for univoltin...

In many organisms, large offspring have improved fitness over small offspring, and thus their size is under strong selection. However, due to a trade-off between offspring size and number, females producing larger offspring necessarily must produce fewer unless the total amount of reproductive effort is unlimited. Because differential gene expression among environments may affect genetic covari...

objective: the experiment was conducted to evaluate the effect of different levels of germinated barley on performance and egg quality in laying hen. methods: one hundred and twenty laying hens, 44-weeks old, lohmann lsl hens were used in this experiment. birds were assigned randomly to the groups, each of which consisted of 20 birds (4 replicate cages each containing 5 birds). the experiment w...

A full-cycle laying hen study was conducted to evaluate crab meal (CM) and lobster meal (LM) as feed ingredients for laying hens by assigning four hundred thirty-two 35-wk-old White Leghorns to 1 of 6 diets [control, 2.5% CM, 2.5% LM, 5% CM, 5% LM, and 2.5% CM + 2.5% LM (blend)]. Productive performance and egg parameters were evaluated every 28-d period. Eggs were collected at 67 wk of age from...

It is necessary to distinguish new and old gypsy moth, Lymantria dispar (L.), egg masses when conducting gypsy moth population surveys. Egg masses within reach from the ground are touched to determine if they contain unhatched eggs and thus are considered new. The following 2 methods are used for egg masses not within reach: (1) visual discrimination between new and old egg masses or (2) by cal...