Abstract
Separation of whey protein from casein in equine milk was achieved by adjustment of pH to 4.3 without addition of calcium, and by ultracentrifugation at 189,000 g for 1 hr. True protein, whey protein, and casein decreased significantly during the first 28 days of lactation with the magnitude of decrease being greatest for whey protein. The proportion of nitrogen in whey protein: casein decreased from 85:15 to 54:46 during the 28 day time period. The concentration of non-protein nitrogen remained relatively constant at 500 mg nitrogen/I but increased in proportion from 2 to 13% of the total nitrogen during the first 28 days of lactation. These results illustrate the unique nitrogen composition of equine milk, which is intermediate between human and ruminant milk, and how it changes during early lactation.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 411-421 |
| Number of pages | 11 |
| Journal | Comparative Biochemistry and Physiology -- Part A: Physiology |
| Volume | 108 |
| Issue number | 2-3 |
| DOIs | |
| State | Published - 1994 |
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Keywords
- Equine
- Equus caballus
- milk composition
ASJC Scopus subject areas
- Physiology
- Molecular Biology
- Biochemistry
Cite this
Protein and nitrogen composition of equine (Equus caballus) milk during early lactation. / Zicker, Steven C.; Lonnerdal, Bo.
In: Comparative Biochemistry and Physiology -- Part A: Physiology, Vol. 108, No. 2-3, 1994, p. 411-421.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Protein and nitrogen composition of equine (Equus caballus) milk during early lactation
AU - Zicker, Steven C.
AU - Lonnerdal, Bo
PY - 1994
Y1 - 1994
N2 - Separation of whey protein from casein in equine milk was achieved by adjustment of pH to 4.3 without addition of calcium, and by ultracentrifugation at 189,000 g for 1 hr. True protein, whey protein, and casein decreased significantly during the first 28 days of lactation with the magnitude of decrease being greatest for whey protein. The proportion of nitrogen in whey protein: casein decreased from 85:15 to 54:46 during the 28 day time period. The concentration of non-protein nitrogen remained relatively constant at 500 mg nitrogen/I but increased in proportion from 2 to 13% of the total nitrogen during the first 28 days of lactation. These results illustrate the unique nitrogen composition of equine milk, which is intermediate between human and ruminant milk, and how it changes during early lactation.
AB - Separation of whey protein from casein in equine milk was achieved by adjustment of pH to 4.3 without addition of calcium, and by ultracentrifugation at 189,000 g for 1 hr. True protein, whey protein, and casein decreased significantly during the first 28 days of lactation with the magnitude of decrease being greatest for whey protein. The proportion of nitrogen in whey protein: casein decreased from 85:15 to 54:46 during the 28 day time period. The concentration of non-protein nitrogen remained relatively constant at 500 mg nitrogen/I but increased in proportion from 2 to 13% of the total nitrogen during the first 28 days of lactation. These results illustrate the unique nitrogen composition of equine milk, which is intermediate between human and ruminant milk, and how it changes during early lactation.
KW - Equine
KW - Equus caballus
KW - milk composition
UR - http://www.scopus.com/inward/record.url?scp=0028310402&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028310402&partnerID=8YFLogxK
U2 - 10.1016/0300-9629(94)90113-9
DO - 10.1016/0300-9629(94)90113-9
M3 - Article
C2 - 7914861
AN - SCOPUS:0028310402
VL - 108
SP - 411
EP - 421
JO - Comparative Biochemistry and Physiology - A Physiology
JF - Comparative Biochemistry and Physiology - A Physiology
SN - 1095-6433
IS - 2-3
ER -