Effect of inositol and phytases on hematological indices and α-1 acid glycoprotein levels in laying hens fed phosphorus-deficient corn-soybean meal-based diets

Krzysztof Żyła , Maja Grabacka , Małgorzata Pierzchalska , Robert Duliński , Anna Starzyńska-Janiszewska

Abstract

The effects of feeding low nonphytate phosphorus (NPP) corn-soybean meal-based diets supplemented with myo-inositol at 0.1%, or with phytase B at 1,300 acid phosphatase units/kg, or with phytase B enriched in 6-phytase A at 300 phytase units/kg on the hematological indices and the α-1 acid glycoprotein (AGP) concentrations in the blood of Bovans Brown laying hens were investigated. The experimental design comprised also a negative control diet and an internal control diet that had the NPP content adjusted by the addition of 0.304 g of monocalcium phosphate per kg to reach the NPP level similar to that resulting from the combined action of both phytases. A total of sixty 50-wk-old hens were randomly assigned to the dietary treatments with 12 cage replicates of 1 hen, and fed the experimental diets until wk 62, when the blood samples were taken and analyzed for basic hematological indices and for AGP concentrations in sera. The hematological indices from all the experimental groups remained in a normal range; nevertheless, the statistically significant effects of diet on hemoglobin concentration (P = 0.003), erythrocyte counts (P = 0.035), the percentage of lymphocytes (P = 0.020), heterophils (P = 0.002), eosinophils (P = 0.023), and basophils (P = 0.001) in the leucocyte population, as well as on the heterophil to lymphocyte ratio (P = 0.003), were observed. The highest erythrocyte counts were characteristic for hens fed the diet supplemented with both phytase A and phytase B. The highest heterophil to lymphocyte ratios were found in blood of hens fed the diet supplemented with phytase B, whereas the highest basophil percentages and the highest AGP concentrations occurred in birds fed the negative control diet. A highly significant correlation was observed between AGP concentrations in sera and BW losses determined previously. The results indicate that the low-NPP corn soybean meal-based diets increased acute phase protein level in laying hens. Phytase B alone, and particularly in combination with phytase A, acted as a potent mediator of the response, whereas supplementary myo-inositol did not.
Author Krzysztof Żyła (FoFT / DoFB)
Krzysztof Żyła,,
- Department of Food Biotechnology
, Maja Grabacka (FoFT / DoFB)
Maja Grabacka,,
- Department of Food Biotechnology
, Małgorzata Pierzchalska (FoFT / DoFB)
Małgorzata Pierzchalska,,
- Department of Food Biotechnology
, Robert Duliński (FoFT / DoFB)
Robert Duliński,,
- Department of Food Biotechnology
, Anna Starzyńska-Janiszewska (FoFT / DoFB)
Anna Starzyńska-Janiszewska,,
- Department of Food Biotechnology
Journal seriesPoultry Science, ISSN 0032-5791, (A 35 pkt)
Issue year2013
Vol92
No1
Pages199-204
Publication size in sheets0.5
Keywords in Englishphytase, inositol, phosphorus deficiency, hematology, α-1 acid glycoprotein
DOIDOI:10.3382/ps.2012-02651
URL http://ps.oxfordjournals.org/content/92/1/199.long
Internal identifierWTŻ/2013/56
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 26-07-2017, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 26-07-2017, ArticleFromJournal
Publication indicators WoS Citations = 3
Citation count*6 (2020-04-02)
Additional fields
FinansowanieThe support of the Polish Ministry of Science and Higher Education provided under grant No. N N311 307736 is gratefully appreciated.
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