Rapeseed meal and egg taint: Treatment of rapeseed meal to reduce tainting potential     

G. R. Fenwick  A. Hobson‐Frohock  D. G. Land  R.F. Curtis 《British poultry science》1979,20(3):323-329

1. Treatment of rapeseed meal with calcium hydroxide suspension decreased the sinapine content by up to 90%. Smaller decreases were obtained by autolysis, steaming and treatment with ammonia.

2. When this treated meal was fed to susceptible ("tainting") hens the concentration of trimethylamine in the eggs was decreased to much less than that required to cause taint.  相似文献   

Effect of light,vitamin d and dietary phosphorus on egg‐shell quality late in the pullet laying year     

A. L. Yannakopoulos  T. R. Morris 《British poultry science》1979,20(3):337-342

1. Eighteen diets supplying all combinations of three phosphorus contents (3.1, 4.0 and 4.8 g non‐phytate P/kg) and six vitamin D supplements (37.5 or 150 μg cholecalciferol/kg; or 16 or 24 μg 25‐hydroxy‐cholecalciferol/kg; or 37.5 μg cholecalciferol/kg with either 16 or 24 μg 25‐hydroxycholecalciferol/kg) were fed to 2 880 pullets of two stocks from 64 to 74 weeks of age. The birds were housed in eight light‐proof rooms, four of which had 24‐h light‐dark cycles (16L : 8D) and four had 28‐h cycles (20L : 8D).

2. The dietary treatments had no significant effect upon food intake, egg output, shell thickness, shell deformation or specific gravity of the eggs.

3. The 28‐h cycle reduced mean rate of lay by 4.5%, increased egg weight by 5.8% and increased shell thickness by 9.4%. The proportion of eggs with shell faults revealed on candling was reduced from 4.1 % to 2.8%.

4. It is concluded from this and other sources that decreasing dietary phosphorus or modifying vitamin D supplements may sometimes lead to increases in shell thickness of the order of 1 to 2%, but that these changes are unlikely to result in a measurable reduction in the proportion of cracked eggs late in the laying year.

5. A 28‐h light‐dark cycle results in a longer and more uniform interval between consecutive ovipositions and thus gives reliable increases in shell thickness which are large enough to reduce the proportion of cracked eggs in many practical situations. Whether it is profitable to use an ahemeral cycle will depend upon the relative prices paid for eggs of different sizes.  相似文献   

Habituation by the immature fowl in response to repeated injections of corticotrophin.     

B M Freeman  A C Manning  I H Flack 《British poultry science》1979,20(4):391-399

1. Immature birds treated for 7 d with corticotrophin (30 IU/kg, one injection per day) had significantly poorer growth rates and decreased adrenal cholesterol concentrations. Plasma glucose, corticosterone and cholesterol concentrations and adrenal weight were within the normal range 24 h after the last injection.

2. The responses of birds pretreated as described above to a single injection of corticotrophin (30 IU/kg) were determined.

3. A similar degree of hyperglycaemia had developed in both groups after 2 h but thereafter the responses differed: the concentration of plasma glucose did not increase further in those pretreated with corticotrophin and had begun to decrease at 6 h, whereas that of the birds pretreated with saline increased progressively.

4. The concentrations of plasma corticosterone had increased similarly in the two groups to a peak at 2 h but there was a significantly more rapid decrease in the birds pretreated with corticotrophin.

5. Both groups showed a transient hypercholesteraemia but the increase was significant only in the group that had previously received saline.

6. There were decreases in the concentrations of adrenal cholesterol in both groups. The decrease, in absolute terms, was 2–4 times greater in the group receiving corticotrophin for the first time: percentage changes were similar, however.  相似文献   

Selection for food conversion in broilers: Direct and correlated responses to selection for body‐weight gain,food consumption and food conversion ratio     

R. A. E. Pym  P. J. Nicholls 《British poultry science》1979,20(1):73-86

1. Direct and correlated responses were determined after five generations in four lines of chickens selected either for increased body‐weight gain (line W), for increased food consumption (line F), for decreased food conversion ratio (line E), or at random (line C).

2. Realised heritability estimates calculated after five generations of selection were : 0–37 + 0.04 for weight gain (WG); 0.44 + 0.05 for food consumption (FC); 0.21 + 0.04 for food conversion ratio (FCR).

3. Realised genetic correlation estimates were: WG and FC, +0.71 ±006; WG and FCR, ‐0.40±0.09; FC and FCR, +0.27 + 0.09.

4. Zero‐generation heritability and genetic correlation estimates were greater than the realised estimates, and sex linkage appeared to be important in the expression of all three traits.

5. The genetic correlation between FC and FCR was asymmetrical with considerable positive response in FCR in line F (r_g = +0.79) but negligible response in FC in line E (r_g = —0.01).

6. There was an apparent plateau in response in FCR in line E from the third to the fifth selected generations.  相似文献   

Synovial sarcoma of the dog.     

A J Lipowitz  A W Fetter  M A Walker 《Journal of the American Veterinary Medical Association》1979,174(1):76-81

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Neurologic disease induced by equine herpesvirus 1.     

A R Pursell  L T Sangster  T D Byars  T J Divers  J R Cole 《Journal of the American Veterinary Medical Association》1979,175(5):473-474

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AN OESOPHAGEAL DIVERTICULUM IN A DOG     

F.W.G. Hill  B.A. Christie  W.T. Reynolds  R.B. Lavelle 《Australian veterinary journal》1979,55(4):184-187

An 11-month-old male Miniature Poodle was found to regurgitate small volumes of fluid and food particles due to a diverticulum in the thoracic oesophagus. The diverticulum was removed surgically. Histologically the wall contained extensive scar tissue. Longterm recovery was uneventful and 5 months after surgery the dog is in good health  相似文献   

Sarcosporidia of domestic animals and of man]     

M Rommel  A O Heydorn  M Erber 《Berliner und Münchener tier?rztliche Wochenschrift》1979,92(23):457-464

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Intestinal disaccharidase activities of three breeds of swine.     

M A Engstrom  K E Ekstrom  D C Mahan 《Journal of animal science》1979,48(6):1349-1356

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Immunosurveillance and tumorigenesis in BALB/c mice--1. Early reactive state in Peyer's patches.     

V A Toma  F P Retief 《Comparative immunology, microbiology and infectious diseases》1979,2(1):43-53

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