Partitioning of amino acid-nitrogen between tissues was determined in 42 Merino weaner wethers from the CSIRO Haemonchus selection flock, increased resistance to Haemonchus (IRH), decreased resistance to Haemonchus (DRH) and random bred control (C) selection lines.
Voluntary feed intake, diet selection and production were determined in 54 Merino weaner rams from the CSIRO Haemonchus selection flock, increased resistance to Haemonchus (IRH), decreased resistance to Haemonchus (DRH) and random bred control (C) selection lines.
In the cross-classified design, where each strain infects groups of R, S or randomly bred control sheep, parasite adaptation would be indicated by a significant host genotype by nematode strain interaction for traits indicating parasite reproductive success; specifically WEC and, for H. contortus strains, packed cell volume.
The randomly bred control group (Random DPAT Sensitive-RDS) exhibited intermediate temperature decreases (means of 1.6-1.8 1.6-1.8 C), with time overlap with the degreesutions of the seleCted groups.
For the former class, the 5 cross-breed control animals were included.
The animals derived from the vendor had significantly lower lymphocyte counts in the peripheral blood, even when non-stressed, compared with in-house bred control mice (Fig. 1B).
These turkeys were from two genetic lines: RBC2, a randomly bred control line representative of a 1967 commercial turkey [ 10, 19], and F, a subline genetically selected from the RBC2 line for increased 16wk body weight [ 11].
This model consists of two lines: a randomly bred control line of turkeys (RBC2), maintained without selection pressure and representing a commercial turkey from 1967 [ 10], and a unique line genetically derived from the RBC2 birds and selected for over 40 generations solely for 16-wk body weight (F) [ 11].
Fetal numbers were greater (P<0.01) for the selected line (1.06) compared to random bred controls (0.67).
Only a minority of rats emitted distress vocalizations during fear acquisition, but the incidence was less frequent in the offspring of good extinguishers than in poor extinguishers or randomly bred controls.
Our only concern lies with its difficulty, as a new breed of control combines with a good, old fashioned challenge to create an experience perhaps too intense for most tastes.
