• Login
    View Item 
    •   Athenaeum Home
    • University of Georgia Theses and Dissertations
    • University of Georgia Theses and Dissertations
    • View Item
    •   Athenaeum Home
    • University of Georgia Theses and Dissertations
    • University of Georgia Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Protein nutrition of dairy cows fed high fat diets

    Thumbnail
    Date
    2002-08
    Author
    Canseco, Miguel Angel
    Metadata
    Show full item record
    Abstract
    Two experiments were conducted to determine the value of specific protein supplements in lactating dairy cows fed high fat diets. Experiment 1, six feedstuffs (wheat silage, corn, soybean meal, soybean hulls, whole cotton seed, and poultry protein meal) and a protein blend (fish meal and dry distillers grains) were evaluated for ruminal dry matter and crude protein degradation kinetics. Duplicate nylon bags were incubated for 0, 2, 4, 8, 16, 24, 48, and 72 h in two Holstein steers fitted with ruminal cannulae, fed at 3.5 X maintenance. Degradation constants for most of these feeds, except wheat silage, compared closely to values listed in the dairy NRC (4 X maintenance). An NRC value for pet food grade poultry protein meal is not available. Our results indicate that its CP kd is 2.45 %/h and its RUP is 58.49 %. In situ intestinal protein digestibility was obtained for six ruminally incubated feed ingredients (wheat silage, corn, soybean meal, whole cotton seed, and poultry protein meal) and a protein blend (fish meal and dry distillers grains). Quadruplicate nylon bags were introduced into the duodenum of two Hereford steers fitted with permanent cannulae. Six nylon bags were introduced per day with an interval of 15 min between bags. Digestibility values were higher for soybean meal. Poultry protein meal digestibility was lower than soybean meal but higher than the other feeds. Experiment 2, twenty-four high producing Holstein lactating dairy cows were used in a completely randomized design to determine the utilization of pet food grade poultry protein meal as a protein supplement in rations that were relatively high in both fat and fiber. Cows in early lactation ranging between 35 and 126 DIM, were distributed into six groups based on their level of milk production. The basal diet contained approximately 55% wheat silage and 6.5% fat. Treatments varied due to protein supplementation and were described as: 1) positive control-soybean meal (SBM), plus a ruminally undegraded protein (RUP) blend of fish meal (FM), blood meal (BM), and dry distillers grains (DDG); 2) negative control-SBM; 3) PPM-50%, 50% pet food grade poultry protein meal (PPM) substituted for the RUP blend in treatment 1; and 4) PPM-100%, 100% substitution PPM for RUP blend in treatment 1. Cattle were fed behind Calan gates, a common diet for two weeks and treatment diets for 12 wks afterwards. Intake (DMI) was lowest with the positive control diet and fat corrected milk production was higher in the 100% PPM diet. Fat corrected milk, milk fat, fiber digestibility and body weight loss were all lower in cattle fed the negative control. The most interesting response of practical value is the increase in DE concentrations of diets supplemented with RUP sources. This corresponded with an increase in diet NE content. Effect that is complemented with higher fiber and OM digestibilities that appears to be the main responsible for the increased DE. Back fat change detected from ultrasonography was greater in cattle fed the negative control diet. Insulin and blood urea nitrogen (BUN) were influenced by treatment especially during the first 4 weeks. These results indicate that PPM is an economic alternative for more expensive animal based sources of RUP.
    URI
    http://purl.galileo.usg.edu/uga_etd/canseco_miguel_a_200208_ms
    http://hdl.handle.net/10724/29510
    Collections
    • University of Georgia Theses and Dissertations

    Related items

    Showing items related by title, author, creator and subject.

    • Statistical issues on mass spectrometry-based protein identification and quantitation 

      Liu, Shangbin (uga, 2008-12)
      The main goal of analytical proteomics is the complete and quantitative proteome analysis of species, cells, and/or tissues. Although the great success has been achieved via incremental improvements in Mass Spectrometry ...
    • Analysis of protein-DNA interactions within the transcription preinitiation complex of Pyrococcus furiosus 

      Renfrow, Matthew Blain (uga, 2002-12)
      Initiation of transcription requires the assembly of a multi-protein preinitiation complex (PIC) on promoter DNA. The protein-DNA interactions within the transcription PIC of the archaeal hyperthermophile, Pyrococcus ...
    • Use of hydrogen/deuterium exchange-mass spectrometry in the study of cell wall degrading enzymes and their inhibitors 

      Bahrainwala, Tasneem M (uga, 2005-08)
      Mass Spectrometry has developed in the last decade into a mature tool for the study of biomolecules and proteins. It has proven to be an indispensable tool in determining the primary structure of proteins and more recently ...

    About Athenaeum | Contact Us | Send Feedback
     

     

    Browse

    All of AthenaeumCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    About Athenaeum | Contact Us | Send Feedback