Effect of daily diet change from the start of lactation to the peak of lactation diet on ruminal pH with pH courses and changes during the feed day

Effect of daily diet change from the start of lactation to the peak of lactation diet on ruminal pH with pH courses and changes during the feed dayDownload file
HANUSOVSKY, O., BíRO, D., ŠIMKO, M., GáLIK, B., JURáčEK, M., ROLINEC, M., HERKEĽ, R.EFFECT OF DAILY DIET CHANGE FROM THE START OF LACTATION TO THE PEAK OF LACTATION DIET ON RUMINAL PH WITH PH COURSES AND CHANGES DURING THE FEED DAY

2016, 17(4), p.1204 - 1220, DOI: http://dx.doi.org/10.5513/JCEA01/17.4.1832

Abstract

The aim of the study was to find the effect of daily diet change from the start oflactation diet (SL) to the peak of lactation diet (PL) taking account into the lactationnumber (2nd lactation – groups S2L, P2L; 3rd lactation – groups S3L, P3L) usingcontinuous monitoring of ruminal pH using e-bolus at school experimental farm inOponice. Animals (7 Holstein cows) were fed once with Total Mix Ratio ad libitum(between 4:00 and 5:00) and milked 3 times per day (6:00, 12:00 and 18:00). Thebolus which was implemented through Esophagus measured pH and temperaturevalues every 15 minutes (96 data points per day) with accuracy ± 0.1 pH. Data weredownloaded and collected with HathorHBClient v. 1.8.1 and statistically evaluatedwith IBM SPSS v. 20.0 (One-way ANOVA, Tukey Test, Indipendent Samples T-Test).The statistically significant difference (0.74%; P < 0.01) in the daily pH mean betweenSL and PL diet was found. Dairy cows in the SL group had average pH 6.30 ± 0.34and in the PL group 6.25 ± 0.33. The daily pH mean of dairy cows in the 2nd lactation6.45 ± 0.28 (S2L), 6.39 ± 0.25 (P2L) and in the 3rd lactation 6.14 ± 0.32 (S3L), 6.14± 0.34 (P3L) was determined. In the S3L (1.12 ± 1.20%) and P3L (1.19 ± 1.19%)group faster decrease of pH values during 6 hours after feeding than in the S2L (0.75± 0.41%) and in the P2L (0.55 ± 0.34%) group was found. During night better recoverability of pH values in the S3L (1.62 ± 0.88%) and P3L (2.10 ± 0.90%) group than inthe S2L (1.00 ± 0.57%) and in the P2L (1.11 ± 0.70%) group per hour was observed.Overall 8.9% of measured pH under 5.8 in the SL group and 11.9% in the PL groupwas found. The S2L group had pH under the threshold 5.8 from measured values1.6% and P2L group only 1.1%. On the other side the pH values in the S3L groupformed 16.3% and in the P3L group 20.8%.

Keywords:
daily diet changelactation numberph changesph monitoringruminal ph