Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

DHA Content in Milk during Different Lactation Stages

Shaohong Jin
,
Genna Ba
,
Han Chen
ORCID logo ,
Hongsheng Du
,
Panqiao Chen
,
Ke Zhou
,
Dian Wang
* ,
Pengjie Wang
* ORCID logo
Version 1 : Received: 1 December 2023 / Approved: 4 December 2023 / Online: 4 December 2023 (10:10:11 CET)

How to cite: Jin, S.; Ba, G.; Chen, H.; Du, H.; Chen, P.; Zhou, K.; Wang, D.; Wang, P. DHA Content in Milk during Different Lactation Stages. Preprints 2023, 2023120170. https://doi.org/10.20944/preprints202312.0170.v1 Jin, S.; Ba, G.; Chen, H.; Du, H.; Chen, P.; Zhou, K.; Wang, D.; Wang, P. DHA Content in Milk during Different Lactation Stages. Preprints 2023, 2023120170. https://doi.org/10.20944/preprints202312.0170.v1

Abstract

The objective of this study was to assess the effects of parity and lactation stage on the content and conversion rate of DHA in milk from dairy cows fed ruminally protected algae powder. A total of 800 cows were blocked by parity and divided into eight groups (n = 100, three groups of primiparous cows and five groups of multiparous cows) in a six-month experimental period. The lactation period was divided into three stages: 16 – 100 d, 101 – 200 d, and 201–305 d. All cows were fed 100 g of DHA-rich algae powder twice a day, with the DHA content > 13%. Milk samples were collected monthly, and daily milk yield and dry matter intake were recorded. Using infrared spectroscopy, we determined the content of protein, fat, lactose, and total solids in milk and calculated the DHA conversion rate. The results showed that parity and lactation stage had no significant effects on milk composition. However, milk yield and dry matter intake were higher in multiparous cows than in primiparous cows. The DHA content and conversion rate in milk were not significantly different between parity groups but were positively correlated with lactation stage and negatively correlated with milk fat content.

Keywords

DHA-biofortified milk; parity; lactation stage; DHA content; conversion rate

Subject

Biology and Life Sciences, Food Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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