Body Condition Score, Rumination, Intake, Milk Production and Milk Composition of Grazing Dairy Cows Supplemented with Rumen-Protected Lysine and Methionine
The study utilised a pasture grazing based, voluntary traffic automatic milking system to investigate milk production of cows fed a pasture-based diet and supplemented with a pellet formulated with vs. without rumen-protected lysine and methionine (RPLM). The study adopted a switch-over design (over...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-08-01
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| Series: | Dairy |
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| Online Access: | https://www.mdpi.com/2624-862X/2/3/37 |
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| author | Long Cheng Razaq Balogun Fanzeng Meng Frank R. Dunshea Brendan Cullen |
| author_facet | Long Cheng Razaq Balogun Fanzeng Meng Frank R. Dunshea Brendan Cullen |
| author_sort | Long Cheng |
| collection | DOAJ |
| description | The study utilised a pasture grazing based, voluntary traffic automatic milking system to investigate milk production of cows fed a pasture-based diet and supplemented with a pellet formulated with vs. without rumen-protected lysine and methionine (RPLM). The study adopted a switch-over design (over two periods of 5 and 10 weeks, respectively) and used 36 cows and equally allocated them into two experimental groups. The RPLM (Trial) pellet had 2% lower crude protein, but similar metabolizable energy content compared to the Control pellet. Pellet intake was 10.0 and 9.4 kg/day/cow. Milk yield was 36.2 and 34.4 kg/day/cow (<i>p</i> = 0.23), and energy corrected milk was 35.1 and 33.8 kg/day/cow (<i>p</i> = 0.076), and milk solids was 2.55 and 2.46 kg/cow/day (<i>p</i> = 0.073) in the Control and Trial groups, respectively. Milk fat%, milk protein%, milk fat: protein ratio, milking frequency and rumination time were not different between the two groups (<i>p</i> > 0.05). In period 1, plasma glucose was 3.1 mmol/L for both groups and milk urea were 150 and 127 mg/L in the Control and Trial groups, respectively. Both plasma glucose (as a proxy for energy supply) and milk urea (as a proxy for nitrogen use efficiency; NUE) were not different between groups (<i>p</i> > 0.05). This study showed that under a grazing pasture system, feeding lactating dairy cows a low protein pellet with RPLM supplementation, maintained milk production performance and NUE, compared with cows fed a high protein Control pellet diet with no RPLM. Further research should assess the long-term (seasonal) effects of feeding a diet formulated with RPLM on cow intake, health and reproductive performance. |
| first_indexed | 2024-03-10T07:46:56Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2624-862X |
| language | English |
| last_indexed | 2024-03-10T07:46:56Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Dairy |
| spelling | doaj.art-e9ee084dc38743a8b57874322d423b312023-11-22T12:37:00ZengMDPI AGDairy2624-862X2021-08-012346246810.3390/dairy2030037Body Condition Score, Rumination, Intake, Milk Production and Milk Composition of Grazing Dairy Cows Supplemented with Rumen-Protected Lysine and MethionineLong Cheng0Razaq Balogun1Fanzeng Meng2Frank R. Dunshea3Brendan Cullen4Faculty of Veterinary and Agricultural Science, University of Melbourne, Dookie, VIC 3647, AustraliaKemin Industries (Asia) Pte Ltd., 12 Senoko Dr, Singapore 758200, SingaporeFaculty of Veterinary and Agricultural Science, University of Melbourne, Dookie, VIC 3647, AustraliaFaculty of Veterinary and Agricultural Sciences, School of Agriculture and Food, The University of Melbourne, Parkville, VIC 3010, AustraliaFaculty of Veterinary and Agricultural Sciences, School of Agriculture and Food, The University of Melbourne, Parkville, VIC 3010, AustraliaThe study utilised a pasture grazing based, voluntary traffic automatic milking system to investigate milk production of cows fed a pasture-based diet and supplemented with a pellet formulated with vs. without rumen-protected lysine and methionine (RPLM). The study adopted a switch-over design (over two periods of 5 and 10 weeks, respectively) and used 36 cows and equally allocated them into two experimental groups. The RPLM (Trial) pellet had 2% lower crude protein, but similar metabolizable energy content compared to the Control pellet. Pellet intake was 10.0 and 9.4 kg/day/cow. Milk yield was 36.2 and 34.4 kg/day/cow (<i>p</i> = 0.23), and energy corrected milk was 35.1 and 33.8 kg/day/cow (<i>p</i> = 0.076), and milk solids was 2.55 and 2.46 kg/cow/day (<i>p</i> = 0.073) in the Control and Trial groups, respectively. Milk fat%, milk protein%, milk fat: protein ratio, milking frequency and rumination time were not different between the two groups (<i>p</i> > 0.05). In period 1, plasma glucose was 3.1 mmol/L for both groups and milk urea were 150 and 127 mg/L in the Control and Trial groups, respectively. Both plasma glucose (as a proxy for energy supply) and milk urea (as a proxy for nitrogen use efficiency; NUE) were not different between groups (<i>p</i> > 0.05). This study showed that under a grazing pasture system, feeding lactating dairy cows a low protein pellet with RPLM supplementation, maintained milk production performance and NUE, compared with cows fed a high protein Control pellet diet with no RPLM. Further research should assess the long-term (seasonal) effects of feeding a diet formulated with RPLM on cow intake, health and reproductive performance.https://www.mdpi.com/2624-862X/2/3/37cattleamino acidrobotic dairynitrogen efficiency |
| spellingShingle | Long Cheng Razaq Balogun Fanzeng Meng Frank R. Dunshea Brendan Cullen Body Condition Score, Rumination, Intake, Milk Production and Milk Composition of Grazing Dairy Cows Supplemented with Rumen-Protected Lysine and Methionine Dairy cattle amino acid robotic dairy nitrogen efficiency |
| title | Body Condition Score, Rumination, Intake, Milk Production and Milk Composition of Grazing Dairy Cows Supplemented with Rumen-Protected Lysine and Methionine |
| title_full | Body Condition Score, Rumination, Intake, Milk Production and Milk Composition of Grazing Dairy Cows Supplemented with Rumen-Protected Lysine and Methionine |
| title_fullStr | Body Condition Score, Rumination, Intake, Milk Production and Milk Composition of Grazing Dairy Cows Supplemented with Rumen-Protected Lysine and Methionine |
| title_full_unstemmed | Body Condition Score, Rumination, Intake, Milk Production and Milk Composition of Grazing Dairy Cows Supplemented with Rumen-Protected Lysine and Methionine |
| title_short | Body Condition Score, Rumination, Intake, Milk Production and Milk Composition of Grazing Dairy Cows Supplemented with Rumen-Protected Lysine and Methionine |
| title_sort | body condition score rumination intake milk production and milk composition of grazing dairy cows supplemented with rumen protected lysine and methionine |
| topic | cattle amino acid robotic dairy nitrogen efficiency |
| url | https://www.mdpi.com/2624-862X/2/3/37 |
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