Functional state of mammary gland of sows dried off by different techniques
A. Rekiel, K. Czumińska, J. Więcek, W. Bielecki, J. Kulisiewiczhttps://doi.org/10.17221/2358-CJASCitation:Rekiel A., Czumińska K., Więcek J., Bielecki W., Kulisiewicz J. (2007): Functional state of mammary gland of sows dried off by different techniques. Czech J. Anim. Sci., 52: 62-69.
Sows were dried off by a traditional method (control − C, restricted feeding before, during and after weaning) or by a modified one (experimental − E, intensive feeding before, during and after weaning). On day 5−6 after weaning of the 3th litter, in the sows lactating for the period of 6 weeks (experiment I) or 4 weeks (experiment II), histomorphological and caryometric evaluation of mammary alveoli was carried out. The cellular infiltrations (plasmocytes, eosinophils, histiocytes and neutrophils) in the mammary gland showed no significant differences between groups dried off by different techniques. The alveolar epithelial cell DNA index (DI) and nucleus volume (VN) were higher in sows lactating for 4 weeks than in those lactating for 6 weeks and in sows after 3DI values in groups C and E were as follows: 2.092, 1.520, 1.409, 2.443, and VN 42.679, 28.060, 38.064, 48.185. In experiment II, they were 2.072, 3.039, 2.890, 3.208, and VN 52.274, 63.213, 57.980, 63.337, respectively. After weaning of the 3rd litter, the domination of group E compared to group C was found during 4-week lactation (DI − P ≤ 0.01, VN − P ≤ 0.01). In 6-week lactation, more favourable conditions were obtained in group C compared to group E (DI − P ≤ 0.001, VN − P ≤ 0.001). After weaning of the 6th litter, in 4-week lactation, the domination of group E in relation to group C was insignificant: DI + 11.0%, VN + 9.24%, and during 6-week lactation, it was statistically confirmed (DI − P ≤ 0.01, VN − P ≤ 0.01). The results justify the need of intensive feeding during the weaning time in sows with longer lactation compared to those with the shorter one, with the performance period prolonged till the 6th reproduction cycle.Keywords:sows; drying off technique; mammary gland; functional state; DNA index; nucleus volume