Effect of increasing dietary metabolizable protein on nitrogen efficiency in Holstein dairy cows

被引:6
作者
Imran, Muhammad [1 ]
Pasha, Talat Naseer [1 ]
Shahid, Muhammad Qamer [2 ]
Babar, Imran [3 ]
ul Haque, Muhammad Naveed [1 ]
机构
[1] Univ Vet & Anim Sci, Dept Anim Nutr, Lahore 54000, Pakistan
[2] Univ Vet & Anim Sci, Dept Livestock Prod, Lahore 54000, Pakistan
[3] Sharif Dairy Farms, Chiniot 35400, Pakistan
来源
ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES | 2017年 / 30卷 / 05期
关键词
Dairy Cows; Metabolizable Protein; Milk Production; Milk Nitrogen Efficiency; RUMEN-UNDEGRADABLE PROTEIN; MILK-PRODUCTION; DRY-MATTER; PERFORMANCE; ENERGY; SUPPLEMENTATION; CONVERSION; LACTATION; EXCRETION; SYSTEMS;
D O I
10.5713/ajas.16.0564
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Objective: The objective of the study was to determine the effects of increasing levels of metabolizable protein (MP) on lactation performance and nitrogen (N) efficiencies in lactating dairy cows. Methods: Nine multiparous cows in mid lactation [113 +/- 25 days in milk] received three treatments in a 3x3 Latin square design with a period length of 21 days. The treatments were three diets, designed to provide similar energy and increasing supply of MP (g/d) (2,371 [low], 2,561 [medium], and 2,711 [high] with corresponding crude protein levels [%]) 15.2, 18.4, and 20.9, respectively. Results: Increasing MP supplies did not modify dry matter intake, however, it increased milk protein, fat, and lactose yield linearly. Similarly, fat corrected milk increased linearly (9.3%) due to an increase in both milk yield (5.2%) and milk fat content (7.8%). No effects were observed on milk protein and lactose contents across the treatments. Milk nitrogen efficiency (MNE) decreased from 0.26 to 0.20; whereas, the metabolic efficiency of MP decreased from 0.70 to 0.60 in low to high MP supplies, respectively. The concentration of blood urea nitrogen (BUN) increased linearly in response to increasing MP supplies. Conclusion: Increasing MP supplies resulted in increased milk protein yield; however, a higher BUN and low MNE indicated an efficient utilization of dietary protein at low MP supplies.
引用
收藏
页码:660 / 665
页数:6
相关论文
共 30 条
[1]  
[Anonymous], 2007, NUTR CATTL SHEEP GOA
[2]  
[Anonymous], 2001, NATL ACAD SCI
[3]  
AOAC, 1980, OFFICIAL METHODS ANA
[4]   Effects of reduced dietary protein and supplemental rumen-protected essential amino acids on the nitrogen efficiency of dairy cows [J].
Apelo, S. I. Arriola ;
Bell, A. L. ;
Estes, K. ;
Ropelewski, J. ;
de Veth, M. J. ;
Hanigan, M. D. .
JOURNAL OF DAIRY SCIENCE, 2014, 97 (09) :5688-5699
[5]   Feed conversion efficiency in dairy cows: Repeatability, variation in digestion and metabolism of energy and nitrogen, and ruminal methanogens [J].
Arndt, C. ;
Powell, J. M. ;
Aguerre, M. J. ;
Crump, P. M. ;
Wattiaux, M. A. .
JOURNAL OF DAIRY SCIENCE, 2015, 98 (06) :3938-3950
[6]   Milk production responses to different strategies for feeding supplements to grazing dairy cows [J].
Auldist, M. J. ;
Marett, L. C. ;
Greenwood, J. S. ;
Wright, M. M. ;
Hannah, M. ;
Jacobs, J. L. ;
Wales, W. J. .
JOURNAL OF DAIRY SCIENCE, 2016, 99 (01) :657-671
[7]   Effects of decreasing metabolizable protein and rumen-undegradable protein on milk production and composition and blood metabolites of Holstein dairy cows in early lactation [J].
Bahrami-Yekdangi, H. ;
Khorvash, M. ;
Ghorbani, G. R. ;
Alikhani, M. ;
Jahanian, R. ;
Kamalian, E. .
JOURNAL OF DAIRY SCIENCE, 2014, 97 (06) :3707-3714
[8]   CORRELATION OF THE ALPHA-LACTALBUMIN (+15) POLYMORPHISM TO MILK-PRODUCTION AND MILK-COMPOSITION OF HOLSTEINS [J].
BLECK, GT ;
BREMEL, RD .
JOURNAL OF DAIRY SCIENCE, 1993, 76 (08) :2292-2298
[9]   Performance and nitrogen use efficiency in mid-lactation dairy cows fed timothy cut in the afternoon or morning [J].
Brito, A. F. ;
Tremblay, G. F. ;
Bertrand, A. ;
Castonguay, Y. ;
Belanger, G. ;
Michaud, R. ;
Lafreniere, C. ;
Martineau, R. ;
Berthiaume, R. .
JOURNAL OF DAIRY SCIENCE, 2016, 99 (07) :5445-5460
[10]   Efficiency of converting nutrient dry matter to milk in Holstein herds [J].
Britt, JS ;
Thomas, RC ;
Speer, NC ;
Hall, MB .
JOURNAL OF DAIRY SCIENCE, 2003, 86 (11) :3796-3801